1/(m2-m)+(m-5)/(2m2-2) y/(x+y)+xy/(y2-x2)(a+5)/(5a-20)+5/(a2-9a+2_数学解答

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.

人气：157 ℃　时间：2020-04-01 03:39:07

解答

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...