解下列方程 4.3x-1.1=7.5 2(x+1.5)=4.8 4.5x+2=15.5 4.5*6+2x=37 7x-3.4x=0.72 (x+1.4)/3=1.2

如题所述

4.3x-1.1=7.5
4.3x=8.6
x=8.6/4.3
x=2

2(x+1.5)=4.8(两边同时÷2)
x+1.5=2.4
x=2.4-1.5
x=0.9

4.5x+2=15.5
4.5x=15.5-2
4.5x=1.5
x=13.5/4.5
x=3

4.5*6+2x=37
2x+27=37
2x=10
x=5

7x-3.4x=0.72
3.6x=0.72(两边同时×100)
360x=72
x=72/360
x=0.2

(x+1.4)/3=1.2
(x+1.4)/3=6/5(通分)
5(x+1.4)=18
5x+7=18
5x=11
x=11/5
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