17.18计算

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17.18计算
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17.18计算
17.18计算
 

17.18计算

17.原式=3√3-2×√3/2+8-(√3-1)
=3√3-√3+8-√3+1
=√3+9
18. x²-x=0
x(x-1)=0
x1=0,x2=1(不合题意,舍去)
原式=(2-x)/(x-1)×(x-1)/(x-2)²
=1/(2-x)
当x=0时,原式=1/2