1/(m2-m)+(m-5)/(2m2-2) y/(x+y)+xy/(y2-x2)(a+5)/(5a-20)+5/(a2-9a+20)1/(x-3)-6/(x2-9)-(x-1)/(6+2x)注:2在字母后面的是平方.
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![1/(m2-m)+(m-5)/(2m2-2) y/(x+y)+xy/(y2-x2)(a+5)/(5a-20)+5/(a2-9a+20)1/(x-3)-6/(x2-9)-(x-1)/(6+2x)注:2在字母后面的是平方.](/uploads/image/z/2524094-62-4.jpg?t=1%2F%28m2-m%29%2B%28m-5%29%2F%282m2-2%29+y%2F%28x%2By%29%2Bxy%2F%28y2-x2%29%28a%2B5%29%2F%285a-20%29%2B5%2F%28a2-9a%2B20%291%2F%28x-3%29-6%2F%28x2-9%29-%28x-1%29%2F%286%2B2x%29%E6%B3%A8%EF%BC%9A2%E5%9C%A8%E5%AD%97%E6%AF%8D%E5%90%8E%E9%9D%A2%E7%9A%84%E6%98%AF%E5%B9%B3%E6%96%B9.)
1/(m2-m)+(m-5)/(2m2-2) y/(x+y)+xy/(y2-x2)(a+5)/(5a-20)+5/(a2-9a+20)1/(x-3)-6/(x2-9)-(x-1)/(6+2x)注:2在字母后面的是平方.
1/(m2-m)+(m-5)/(2m2-2)
y/(x+y)+xy/(y2-x2)
(a+5)/(5a-20)+5/(a2-9a+20)
1/(x-3)-6/(x2-9)-(x-1)/(6+2x)
注:2在字母后面的是平方.
1/(m2-m)+(m-5)/(2m2-2) y/(x+y)+xy/(y2-x2)(a+5)/(5a-20)+5/(a2-9a+20)1/(x-3)-6/(x2-9)-(x-1)/(6+2x)注:2在字母后面的是平方.
1,=1/m(m-1)+(m-5)/2(m+1)(m-1)
=2(m+1)/2(m+1)(m-1)+(m2-5m)/2(m+1)(m-1)
=(2m+2+m2-5m)/2(m+1)(m-1)
=(m2-3m+2)/2(m+1)(m-1)
=(m-2)(m-1)/2(m+1)(m-1)
=(m-2)/2(m+1)
2,=y/(x+y)+xy/(y-x)(y+x)
=(y2-xy+xy)/(y-x)(y+x)
=y2/(y-x)(y+x)
3,=(a+5)/5(a-4)+5/(a-4)(a-5)
=(a2-25)/5(a-4)(a-5)+25/5(a-4)(a-5)
=a2/5(a-4)(a-5)
4,=(2x+6)-12-(x2-4x+3)/2(x+3)(x-3)
=(x-3)(x-3)/2(x+3)(x-3)
=(x-3)/2(x+3)
2. -Y2/(x2-y2)