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*8,所以X=5.5

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

1/8(x+0.5)=75%
X+0.5=0.75*8,所以X=5.5