分式的混合运算2m2-4m/(2-m)(m-1)-(1+m)/1-m2-1-a2/(a-1)-a-1-a2/(a-1)-a是(-1)-a2/(a-1)-a别看错题目啊

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分式的混合运算2m2-4m/(2-m)(m-1)-(1+m)/1-m2-1-a2/(a-1)-a-1-a2/(a-1)-a是(-1)-a2/(a-1)-a别看错题目啊
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分式的混合运算2m2-4m/(2-m)(m-1)-(1+m)/1-m2-1-a2/(a-1)-a-1-a2/(a-1)-a是(-1)-a2/(a-1)-a别看错题目啊
分式的混合运算
2m2-4m/(2-m)(m-1)-(1+m)/1-m2
-1-a2/(a-1)-a
-1-a2/(a-1)-a
是(-1)-a2/(a-1)-a
别看错题目啊

分式的混合运算2m2-4m/(2-m)(m-1)-(1+m)/1-m2-1-a2/(a-1)-a-1-a2/(a-1)-a是(-1)-a2/(a-1)-a别看错题目啊
(2m^2-4m)/(2-m)(m-1)-(1+m)/(1-m^2)
=2m(m-2)/(2-m)(m-1)-(1+m)/(1-m)(1+m)
=-2m/(m-1)-1/(1-m)
=(2m-1)/(1-m)
(-1)-a^2)/(a-1)-a
=(1-a-a^2-a^2+a)/(a-1)
=-(2a^2-1)/(a-1)