解方程,

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解方程,
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解方程,
解方程,
 

解方程,

x/2+x/4=7.5
x/2+x/4=15/2(通分)
2x+x=30
3x=30
x=30/3
x=10
7.4x-5.6=10+5.4x(移项)
7.4x-5.4x=10+5.6
2x=15.6
x=15.6/2
x=7.8

X÷2+X÷4=7.5
0.5X+0.25X=7.5
0.75X=7.5
X=10
7.4X-5.6=10+5.4X
2X=15.6
X=7.8