1/8(X+0.5)=75%

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1/8(X+0.5)=75%1/8(X+0.5)=75%1/8(X+0.5)=75%x+0.5=0.75*8x=6-0.5x=5.5上课要专心听课才会做啊

1/8(X+0.5)=75%
1/8(X+0.5)=75%

1/8(X+0.5)=75%
x+0.5=0.75*8
x=6-0.5
x=5.5
上课要专心听课才会做啊