小數(shù)混合運(yùn)算專項(xiàng)練習(xí)276題（有答案）

(1)0.11X1.8+8.2X0.11(9)1.8X((3.41-2.9)-0.03]

2)2.34X99+2.3410)0.125X32X2.5.

(3)5.4-2.7X0.811)1.258X18.5-0.258X18.5

4)132X101(12)8.48-0.8X0.9

(5)6.25.1.25.0.813)1.25X2.4

6)2.5X16.(14)5.85-(1.3+0.5)X6.

7)6.33X101-6.3315)17.17.6.8-3.2-6.17

8)1.56X1.7+0.44X1.7(16)5.4X[(1.3+2.15)-0.2]

小數(shù)混合運(yùn)算一1

17)8.4-0.6+8.4-0.425)83.7-12.83-0.17

18)16.8X10.126)5.96+13X(3.2-3.12)

19)10.9-0.9-0.2+1.827)4.32-2.4X1.7;

20)1.25X3.2X0.25.28)16.2X4.5+3.8X4.5；

21)1.36+4.85+2.64+6.1529)9.05-3.86-3.14；

22)98.5-2.5-430)7.28+0.72-0.9

23)5.4-[2.5X(3.7-2.9)]314.32+5.43+6.68

)

24)0.8X(4-3.68)-0.0132)17.17-6.8-3.2

小數(shù)混合運(yùn)算一2

33)5.29X9+5.29(41)15.68-(7.78-4.32)-2.32

34)16.8X10.1(42)0.25X3.2X1.25

(35)2.74X9.5+5X0.274(43)9.99X

1.01

(36)0.36+9.6-3.2.44)4.63X1.4+46.3X0.86

37)3.75X25+6.25X25(45)17.5-0.8-12.5

38)25.46-8.23-1.76(46)0.9+9.9+99.9+999.9

39)2.9+7.1X1047)2.9X99+2.9

40)1.25X32X0.25.48)25X11.2X4

小數(shù)混合運(yùn)算一3

40)1.25X32X0.25.48)25X11.2X4

小數(shù)混合運(yùn)算一4

(49)23.25-6.75-3.25.(57)35.6-5X1.73

(50)125X3.2X2.558)1.6X55.4-55.4X0.6

51)3.6X10.159)17.68-5.2+2.7X1.5.

52)5.8X2.7+0.58X7360)1.08X0.8-0.27

53)3.6+6.4X1.861)102X0.45

(54)(1.48+3.02)-(3.6X0.5)62)22.78-1.25-0.8

55)(36.7-4.9)X101-31.8.63)0.34X101-0.34.

56)6.33X101-6.3364)0.125X32X2.5

小數(shù)混合運(yùn)算一5

65)0.8X6.3-0.8X3.8(73)10.8-0.8-(0.35+0.05)

66)504-3.2X2.08(74)8X[1-(2.3-2.25)]

67)(20-0.8X9)X5.7(75)2.64X9.9+0.264

68)2.4X1.5+3.6-1.5(76)4.52+0.61+1.39+6.48

69)7.38-5.14+3.62-2.86(77)4.27-(1.96-1.73)

70)0.12X1.8+8.2X0.12(78)(294.4-19.2X6)-(6+8)

71)5.4-[0.51-(1.2-1.03)]79)12.5X0.76X0.4X8X2.5.

72)[(8.1-5.6)X0.9-1.05]-0.04.80)4.98+8.02X2.5

小數(shù)混合運(yùn)算一6

81)60.8-40.8-2.5(89)7.236-0.18-14.3X0.02

82)0.8X69.6X12.5(90)9.6-0.4X0.25

83)4.98X99+4.9(91)29.7-(5.85-0.65)

84)6.48-3.2-2.5(92)7.4X9.9

85)1.2X7.6+7.6X6.8.(93)3.84-2.7X0.64

86)(9.4-5.8)X2.07(94)8.68-8.68-0.56X0.5

88)(9.36X5+9.36+9.36X2)X1.25(96)2.72-[(8.2-6.5)X0.5];

小數(shù)混合運(yùn)算-

87)12.54-4.56-3.44-1.54(95)4.7X4.7+4.7+4.3X4.7.

88)(9.36X5+9.36+9.36X2)X1.25(96)2.72-[(8.2-6.5)X0.5];

小數(shù)混合運(yùn)算-8

(97)9.12+9.12X9-60.2;105)11.87-(8.2+1.87)

(98)28.4-0.4-0.25;106)5.42-3.87-1.13

(99)27.36-27.36-7.6.107)4.38-1.56+0.62-0.44

100)3.25X0.45+6.75X0.45108)0.4X270X2.

(101)31.5-24.5-3.5109)(40+1.25)X8

102)7.5X102110)(12.5-0.05)X8

103)6.3+3.7X2.8.111)2.6X8.5+8.5X7.4

104)2.15+8.73+1.27+7.85112)9.9X6.9-6.9X3.9

小數(shù)混合運(yùn)算一9

(113)5.6X99+5.6(121)0.25X1.25X3.2

(114)2.5X(1.9+1.9+1.9+1⑼122)6.4X14+15X6.4+6.4

(115)7.2-1.25-&(123)(1.3+1.3X0.125X8)-(80-77.4)

(116)52.4-(15+0.6)-1.6(124)4X(25+2.5+0.25)-111

117)9.87X99+9.87(125)6.25-((17.2-3.6X4.5)-0.32]

(118)46.8-0.9-0.4126)28.4X99+28.4

119)5.5X17.3+6.7X5.5.127)0.94X2.5-0.45

120)99X4.2+4.2128)4X0.8X12.5X2.5

小數(shù)混合運(yùn)算一10

(129)17.5-0.25X17+13.(137)7.5.(5.5+1.24)

(130)10.1X87138)0.26+15.68+9.74+2.32

(131)2.3+3.19-(22-19.8)139)13.26+9.55-3.26

(132)1.25X7.2.140)6.1+3.9-6.1+3.9.

133)9.1-1.2.6-6.24(141)31.7-0.63(保密2位小數(shù))

134)7.3+12.8-3.8X2.3(142)2.4X1.5+3.6-1.5

(135)(5.36+7.64)-13X100(143)0.32X0.25+0.08-4

(136)7.575-[(5.63-1.88)X0.2],(144)(9.6+1.48-3.7)-8

小數(shù)混合運(yùn)算一11

(145)5.8-[4X(1.34-0.14)](153)(45+14)-73+710.

(146)5.4-[0.51-(1.2-1.03)].(154)13.7X0.125X8

147)21.35-3.25-16.75155)0.8X[13-(3.12+5.28)]

148)33.02-(148.4-90.85)-2.5156)102X0.56

149)32X2.5X0.125157)1.53X1.7+0.47X1.7.

150)18.1+(3-0.299-0.23)X1.158)5.18+0.73+0.82

151)67-(2.98+0.67)159)0.75X1.8-1.5

152)8X16-73.8X6160)12.5X7.1X0.8

小數(shù)混合運(yùn)算一12

(161)6.12X99+6.12169)12.7+12.5+0.5

(162)8.6-0.86+8X0.35(170)91-2.6-0.05=

(163)5.6X(18.5-8.5-0.5)171)6.3X3.7+6.3X6.3=

164)0.125X4.78X80(172)(3.7+1.7X0.4)-2.5=

165)2.8X3.6+1.4X2.8(173)7.28+3.2-2.5=

166)(0.4+40)X2.5174)0.74+0.9X7.4=

167)78.7-17.7X3.6(175)7.8-0.125-0.8-

(168)18-[0.3X(8-6.5)](176)37.5-[0.3X(1.34-0.84)]

小數(shù)混合運(yùn)算一13

(177)(2.5+27.75-1.5)X1.6.(185)64X4.5+3.6X45

(178)6.21-3.8+2.2186)1.25X3.2X0.8

179)6.03+3.7+2.97187)14.5X102

180)17.43-6.57-2.43188)14.64+3.7X2.8

181)20.47-(1.47+6.8)(189)8.4-0.21-0.5.

182)13.26+4.71+3.47+5.29

183)22.74+8.68-13.74.190)0.125X9X8X0.3

(184)10-0.2-2.5(191)4.62-5-0.66

小數(shù)混合運(yùn)算一14

192)5.78X2.3+5.78+5.78X6.7(200)18.2-10.6X(0.9-0.75)

193)7.75X[20-(3.24-3.04)].201)0.25X3.85X40

199)

小數(shù)混合運(yùn)算…15

192)5.78X2.3+5.78+5.78X6.7(200)18.2-10.6X(0.9-0.75)

194)1.25X0.5X8X0.2(202)1.46X3.5+3.5X4.54.

195)0.97X9+0.97(203)7X12.5X0.8

196)5.4-[3X(3.8-2.9)].(204)4.7X3.6+4.7X6.4

197)0.4X(3.2-0.8)-0.15(205)1.45X[(2.8+4.4)-2.4].

198)5.7+1.9X0.2-7.6(206)4.2X(6.18-3.03)+6.3

32.4X6.3+32.4X3.7(207)15.02-6.8-(1.02+1.2)

199)

小數(shù)混合運(yùn)算一16

(208)0.6X[(5-0.68)-1.2]

(209)2.7-4+6.3X0.25217)9.08+5.45+11.92+4.55

(210)(6.02+2.8)-0.4-2.05218)1.25X30X1.2X0.8.

211)3.08X3.5+6.2X3.08+3.08X0.3.219)0.6+0.94-0.208

(212)2.3+3.91-(22-19.7)220)4.85X1.25X8

(213)21.6-[64.8-(48.6-2.7X2)].(221)(64-22.4-1.4)X1.2

214)93.6X3.6+1.4X3.6222)18.3-6.25-3.75

215)0.25X0.8X0.125X0.4223)2.8X3.6+1.4X2,8

小數(shù)混合運(yùn)算一17

(224)6.6-f-[14.5-(1.7+1.8)](232)[(7.6-5.2)-0.4+2.54]/32.

(225)0.25X9.87X4(233)17.68-5.2+2.7X1.5

226)36.7X2.1+10.8234)35.6-5X1.73

227)8.45-0.45X0.1235)(1.1-0.78)X(2.7-1.95)

228)0.73X102236)1.3X0.75X4

229)7.8X5.6+2.3X4.4(237)1.08-1.8X1.2

230)76.3X27-76.3X17.238)50.4X1.9-1.8

231)7.05X23.7+7.05X76.3.239)0.82X0.25+1.18X0.25.

小數(shù)混合運(yùn)算一18

240)8.5X((2.36+2.42)-0.25](248)8X(20-1.25)

241)3.9-[(1.3+0.6)X6-3.6](249)0.654+10.9X6.5

(242)4.25X6.3+3.7X4.25(250)22.7X1.25X0.8

243)205X0.99251)3.91X2.8+6.09X2.8.

(244)25.6-7.49-2.51252)6.23+3.09=

245)[2.5-(6.8-4.9)]X0.8.253)132.4-59.8=

246)102X4.5254)6.62X0.84=

(247)3.4-[(1.2+0.5)X5](255)2.07-0.023=

小數(shù)混合運(yùn)算一19

(247)3.4-[(1.2+0.5)X5](255)2.07-0.023=

小數(shù)混合運(yùn)算一20

(256)[20.026-(8.6+9.7)X0.92]-30.19.

257)0.125X32X2.5265)10.36+4.8-16.5-5；

258)0.8X6.3-0.8X3.8266)12.5X2.4.

(259)50.4-3.2X2.08267)38.78-19.59+41.22-30.41

(260)204-(3.4X0.5)268)2.74X4.86+4.86X6.26+4.86

261)(43.26+2.34)-7.5269)0.08X(12.5+2.5)X0.1

262)(20-0.8X9)X5.7.270)25.92+(10.1-14.5X0.2)

263)13.25-0.8+1.75-1.2：271)0.487X12.5-48.7

小數(shù)混合運(yùn)算一21

(272)(8.16+2.09)-[(10.3-9.3)-0.4].

273)1.56X1.7+0.44X1.7(276)30.8-[(6.34-4.59)X4].

274)12.5X(7.2-1.9)X0.8

小數(shù)混合運(yùn)算一22

參考答案：

(1)0.11X1.8+8.2X0.11,=10.6X0.9,

=0.11X(1.8+8.2),=9.54；

=0.11X10,

(13)1.25X2.4,

=1.1；=1.25X8X0.3,

(2)2.34X99+2.34,

=10X0.3,

=2.34X(99+1),

=3：

=2.34X100,

(14)5.85-(1.3+0.5)X6,

=234；

=5.85-1.8X6,

(3)5.4-2.7X0.8,

=3.25X6,

=2X0.8,

=19.5

=1.6；

(15)17.17-6.8-326.17

(4)132X101,

=(17.17-6.17)-(6.8+3.2),=11-10,

=132X(100+1),

=1;

=132X100+132,

(16)5.4X[(1.3+2.15)-0.2]

=13332；

=5.4X[3.45-0.2],

(5)6.25-1.25-0.8,

=6.25-(1.25X0.8),=5.4X17.25,

=6.25-1,=93.15；

=6.25；(17)8.4-0.6+8.4-0.4

=14+21

(6)2.5X16,

；

=(2.5X4)X4,=35

=40(18)16.8X10.1

(7)6.33X101-6.33,=16.8X10+16.8X0.1，

=6.33X(101-1),=168+1.68,

=6.33X100,=169.68:

=633；

(19)10.9-0.9-0.2+1.8

(8)1.56X1.7+0.44X1.7,

=10.9-4.5+1.8,

=1.7X(1.56+0.44),

=8.2；

=1.7X2,

(20)1.25X3.2X0.25

=3.4；

=(1.25X0.8)X(4X0.25),

(9)1.8X[(3.41-2.9)-0.03],

=1X1,

=1.8X[0.51-0.03],

=1

=1.8X17,

(21)1.36+4.85+2.64+6.15,

=30.6：

=(1.36+264)+(4.85+6.15),=4+11,

(10)C.125X32X2.5,

=15；

=(0.125X8)X(4X2.5),

(22)98.5-2.5-4,

=1X10,

=98.5-(2.5X4),

=10

=98.5-10,

(11)1.258X18.5-0.258X18.5,

=18.5X(1.258-0.258),=9.85；

=18.5X1,(23)5.442.5X(3.7-2.9)b

=18.5;=5.4-[2.5X0.8],

(12)848-0.8X0.9,=5.4-2,

小數(shù)混合運(yùn)算一23

=2.7；

(24)08X(4-3.68)-0.01,

=0.8X0.32-0.01,

=0.256-0.01,

=25.6：

小數(shù)混合運(yùn)算一24

=250；

(25)83.7-12.83-0.17,(38)25.46-8.23-1.76,

=83.7-(12.83+0.17),=25.46-(8.23+1.76),

=83.7-13,=25.46-9.99

=70.7；=15.45；

(26)5.96+13X(3.2-3.12),(39)2.9+7.1X10,

=5.96+13X0.08,=2.9+71,

=5.96+1.04,=73.9；

=7.(40)1.25X32X0.25

(27)4.32-2.4X1.7,=1.8X1.7,=(1.25X8)X(4X0.25),

=3.06；=10X1,

=1.

(28)16.2X4.5+3.8X4.5,

(41)15.68-(7.78-4.32)-2.32,

=(16.2+3.8)X4.5，

=15.68-7.78+4.32-2.32,

=20X4.5,

=(15.68+4.32)-(7.78+2.32),

=90；

=20-10,

(29)9.05-3.86-3.14,

=10：

=9.05-(3.86+3.14),

(42)0.25X3.2X1.25,

=9.05-7,

=0.25X4X0.8X1.25,

=2.05;

=(0.25X4)X(0.8X1.25),

(30)7.28+0.72-0.9,=1X1,

=7.28+0.8,=1：

=8.08(43)9.99X1.01,

(31)4.32+5.43+6.68,=(10-0.01)X1.01,

=4.32+6.68+5.43,=10.1-0.0101,

=11+5.43，=100899:

=16.43；(44)4.63X1.4+46.3X0.86,

(32)17.17-6.8-3.2,=46.3X014+46.3X0.86,

=17.17-(6.8+3.2),=46.3X(0.14+0.86),

=17.17-10,=46.3X1,

=7.17；=46.3；

(33)5.29X9+5.29,(45)17.5-0.8-12.5,

=5.29X(9+1),=17.5-(0.8X12.5),

=17.5-1,

=5.29X10,

=17.5:

=52.9；

(46)0.9+9.9+99.9+999.9,

(34)16.8X10.1,

=1-0.1+10-0.1+100-0.1+1000-0.1,

=16.8X10+16.8X0.1,=168+1.68,=(1+10+100+1000)-(0.1+0.1+0.1+0.1),=1111-

=169.68：0.4,

(35)2.74X9.5+5X0.274,=1110.6

(47)2.9X99+2.9

=2.74X9.5+0.5X2.74,

=(99+1)X2.9,

=2.74X(9.5+0.5),=2.74X10,

=100X29,

=27.4；

=290：

(36)0.36+9.6-3.2,

=0.36+3,

小數(shù)混合運(yùn)算一25

=250；

(48)25X11.2X4

=25X4X11.2,

=100X11.2,

=1120；

(49)23.25-6.75-3.25

小數(shù)混合運(yùn)算一26

=23.25-(6.75+3.25),=100X0.45+2X0.45,

=23.25-10,=45+0.9,

=13.25

=45.9；

(50)125X3.2X2.5,

(62)22.78-1.25-0.8

=125X8X0.4X2.5,

=22.78-(1.25X0.8),

=(125X8)X(0.4X2.5),

=22.78-1,

=1000X1,

=22.78；

=1000：

(63)0.34X101-0.34

(51)3.6X10.1,=(101-1)X0.34,

=3.6X(10+0.1),=100X0.34,

-3.6X10*3.6X0.1,=34

(64)0.125X32X2.5,

=36+0.36，

=(0.125X8)X(4X2.5),

=36.36；

=1X10,

(52)58X2.7+0.58X73,

=10：

=5.8X2.7+5.8X7.3,

(65)0.8X6.3-0.8X3.8,

=5.8X(27+7.3),=0.8X(6.3-3.8),

=5.8X10,=0.8X2.5,

=58：=2；

(53)3.6+6.4X1.8,(GG)504-3.2X2.08,

=3.6+11.52,=157.5X2.08,

=327.6；

=15.12；

(54)(1.48+3.02)-(3.6X0.5),(67)(23-0.8X9)X5.7,

=(20-7.2)X5.7,

=4.5-1.8,

=12.8X5.7,

=2.5；

=72.96

(55)(36.7-4.9)X101-31.8,

(68)2.4X1.5+3.6-1.5,

=31.8X101-31.8，

=3.6+2.4,

=31.8X(101-1),

=6；

=31.8X100,

(69)7.38-5.14+3.62-2.86,

=3180

=(7.38+3.62)-(5.14+2.86),

(56)6.33X101-6.33

=11-8,

=6.33X(101-1),

=3；

=6.33X100,

(70)0.12X1.8+8.2X0.12,

=633：

=0.12X(1.8+8.2),

(57)35.6-5X1.73,

=0.12X10,

=35.6-8.65,

=1.2；

=26.95；

(71)5.4-[0.51-(1.2-1.03)],

(58)1.6X55.4-55.4X0.6,

=5.4-[0.51-0.17],

=55.4X(1.6-0.6),

=5.4-3,

=55.4X1,

=1.8；

=55.4；(72)[(8.1-5.6)X0.9-1.05]-0.04,

(59)17.68-5.2+27X1.5,=[2.5X0.9-1.05]-0.04,

=3.4+4.05,=[2.25-1.05]-0.04,

=7.45=1.2-0.04,

(60)1.08X0.8-0.27=30

=1.08-0.27X0.8,(73)10.8-0.8-(0.35+0.05),

=4X0.8,=10.8-0.8—0.4,

小數(shù)混合運(yùn)算一27

=10.8-2

小數(shù)混合運(yùn)算一28

=8.8；=60.8

(74)8X[1-(2.3-2.25)],(86)(9.4-5.8)X2.07,

=8X(1-0.05],=3.6X2.07,

=8X20,

=7.452；

=160：

(87)12.54-4.56-3.44-1.54.

=(12.54-1.54)-(4.56+3.44),=11-8,

(75)