解方程 X+40%X=42

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解方程X+40%X=42解方程X+40%X=42解方程X+40%X=42X+40%X=421.4x=42x=30x+0.4x=421.4x=42x=42/1.4x=30z+0.4x=421.4x=42

解方程 X+40%X=42
解方程 X+40%X=42

解方程 X+40%X=42
X+40%X=42
1.4x=42
x=30

x+0.4x=42
1.4x=42
x=42/1.4
x=30

z+0.4x=42
1.4x=42
x= 42/1.4
=30

1.4X=42
X=30