五年級(jí)上冊(cè)數(shù)學(xué)解方程六大類型專項(xiàng)類型一：x+a=b(x-a=b)未知數(shù)在一邊且系數(shù)為1①0.3x+0.6=1.8解:0.3x=1.8-0.60.3x=1.20.3x÷0.3=1.2÷0.3x=4②4x-1.3x6=2.6解:4x-7.8=2.64x=2.6+7.8x÷4=10.4÷4x=26③2x-0.2=40解:2x-0.2+0.2=40+0.22x=40.22x÷2=40.2÷2x=20.1④7×(6.5+x)=87.5解:7×6.5+7x=87.57x=87.5-45.5x=6⑤5×(x+0.8)=10.2解:5x+5×0.8=10.25x=10.2-45x÷5=6.2÷5x=1.24⑥4.8+5x-2.7=3.1解:2.1+5x=3.15x=3.1-2.15x÷5=1÷5x=0.2類型二:ax=b(a≠0)或x÷a=b(a≠o)未知數(shù)系數(shù)不為1①5.6x=33.6解:5.6x÷5.6=33.6÷5.6x=6②75.6÷x=12.6解:x=75.6÷12.6x=6③(x-3)÷2=7.5解:(x-3)=75×2x=15+3x=18④3x÷5=4.8解:3x÷5×5=4.8×53x=243x÷3=24÷3x=8⑤(x-20)÷0.5=15解:x-20=15×0.5x=7.5+20x=27.5⑥x÷0.3+0.5=1.7解:x÷0.3=1.7-0.5x÷0.3=1.2x÷0.3×0.3=1.2×0.3x=0.36五年級(jí)上冊(cè)數(shù)學(xué)解方程六大類型專項(xiàng)類型三:ax+b=c、ax-b=c(a≠0)未知數(shù)系數(shù)不為1①0.3x-0.8=2.8解:3x-0.8+0.8=2.8+0.83x=3.6x÷3=3.6÷3x=1.2②x+3x+10=704x+10=70解:4x+10-10=70-104x÷4=60÷4x=5③0.3×7+4x=12.5解:2.1+4x=12.54x=12.5-2.14x÷4=10.4÷4x=2.6④4x-1.3×6=2.6解:4x-78=2.64x=2.6+7.84x÷4=10.4÷4x=2.6⑤3x-4.5+1.5=6解:3x-3=63x=6+33x÷3=9÷3x=3解:0.1x+0.6=1.320.1x=1.32-0.60.1x=0.720.1x÷0.1=0.72÷0.1x=7.2類型四:(x±b)÷a=c、a(x±b)=c(a≠0)及變型①2(x-3)=5.8解:x-3=5.8÷2x=2.9+3x=5.9②(x+0.7)×3-4=20解:(x+0.7)×3=20+4x+0.7=24÷3x=8-0.7x=7.3③1.3×(x-0.5)=16.9解:x-0.5=16.9÷1.3x=13+0.5x=13.5④(x+6)×5=100+5解:5x+30=1055x=105-305x÷5=75÷5x=15⑤(x-0.8)÷0.7=0.4解:x-0.8=0.4×0.7x-0.8=0.28x=0.28+08x=1.08⑥7×(6.5+x)=87.5解:6.5+x=87.5÷76.5+x=12.5x=12.5-6.5x=6五年級(jí)上冊(cè)數(shù)學(xué)解方程六大類型專項(xiàng)類型五:ax士bx=C(a≠0,b≠0),同側(cè)有兩個(gè)未知數(shù)①0.1×(x+6)=3.3×0.4解:0.3x+0.2x=0.150.5x=0.15x=0.15÷0.5x=0.3②10.5x+6.5x-50=1解:17x-50=117x=50+1x=51÷17x=3③7x-2.5-2x=10解:5x-2.5=105x=10+2.5x=12.5÷5x=2.5④解:4x+3.2=84x=8-3.2x=4.8÷4x=1.2⑤13.2x+9x-3.3=30解:22.2x=30+3.3x=33.3÷22.2x=1.5⑥10x-5x=0.3解:5x=0.3x=0.3÷5x=0.06類型六:ax士b=cx士d方程兩邊都有未知數(shù)①4x+0.3=2x+0.8解:4x-2x=0.8-0.32x=0.5x=0.5÷2x=0.25②6.3+0.5x=1.2x解:6.3=1.2x-0.5x0.7x=6.3x=6.3÷0.7x=9③20x=2.4+14x解:20x-14x=2.46x=2.4x=2.4÷6x=0.4④7.5-2x=3x-1.5解:7.5+1.5=3x+2x5x=9x=9÷