请你先对(x三次方-x²)/(x²-x)进行化简,再取一个使原式有意义,而你又喜爱的数代入求值
问题描述:
请你先对(x三次方-x²)/(x²-x)进行化简,再取一个使原式有意义,而你又喜爱的数代入求值
(x三次方-x²)/(x²-x)-(1-x²)/(x+1)
上面式子错了,是这个化简
请你先对(x三次方-x²)/(x²-x)-(1-x²)/(x+1)进行化简,再取一个使原式有意义,而你又喜爱的数代入求值
答
(x^3-x²)/(x²-x)-(1-x²)/(x+1)
=x²(x-1)/x(x-1)-(1+x)(1-x)/(x+1)
=x-(1-x)
=2x-1 (取x=1)
=2x1-1
=1