(x+2)/x(x-2)-(x-1)/x²-4x+4=几,
问题描述:
(x+2)/x(x-2)-(x-1)/x²-4x+4=几,
答
(x+2)/[x(x-2)] - (x-1)/(x²-4x+4)
=(x+2)/[x(x-2)] - (x-1)/(x-2)²
=[(x+2)(x-2)- x(x-1)]/[x(x-2)²]
=(x²-4-x²+1)/[x(x-2)²]
=-3/[x(x-2)²]老师的答案是3/(x-2)你题目有没抄错哈?我也不知道哈,按记忆来的。你题目有没抄错哈?另外更正一下:(x+2)/[x(x-2)] - (x-1)/(x²-4x+4)=(x+2)/[x(x-2)] - (x-1)/(x-2)²=[(x+2)(x-2)- x(x-1)]/[x(x-2)²]=(x²-4-x²+x)/[x(x-2)²]=(x-4)/[x(x-2)²]搞错了,老师的答案是x+2/x-2哦哦,关键的一点,原题目是什么?这就是原题呵呵,如果题目没问题,那就是你们老师解错了!