第24题 怎么写急急急数学初二
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（2）题错了
2x²/(x²-1)-x/(x+1)
=(2x²-x²+x)/(x-1)(x+1)
=x(x+1)/(x+1)(x-1)
=x/(x-1)
(3)题
[a+1-(4a-5)/(a-1)]÷[1/(a-1)-2/(a²-a)]
=(a²-1-4a+5)/(a-1)÷[(a-2)/a(a-1)]
=(a²-4a+4)/(a-1)Xa(a-1)/(a-2)
=a(a-2)²/(a-2)
=a(a-2)
=a²-2a
2x²/(x²-1)-x/(x+1)
=(2x²-x²+x)/(x-1)(x+1)
=x(x+1)/(x+1)(x-1)
=x/(x-1)
(3)题
[a+1-(4a-5)/(a-1)]÷[1/(a-1)-2/(a²-a)]
=(a²-1-4a+5)/(a-1)÷[(a-2)/a(a-1)]
=(a²-4a+4)/(a-1)Xa(a-1)/(a-2)
=a(a-2)²/(a-2)
=a(a-2)
=a²-2a
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