先化简,再选取一个使原式有意义而你又喜欢的数代人求值:x³-x²/x²-x÷1-x²/x+1.
题目
先化简,再选取一个使原式有意义而你又喜欢的数代人求值:x³-x²/x²-x÷1-x²/x+1.
答案
(X^3-X^2)/(X^2-X)÷(1-X^2)/(X+1)
=X^2(X-1)/X(X-1)÷(1-X)(1+X)/(X+1)
=X÷(1-X)
=X/(1-X)
因为分母不为0,X不为0,1,-1
取X=2代入：
X/(1-X)=2/(1-2)=-2
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