通分 [(x-b)-(x-a)]/(x-a)(x-b)=[(x-d)-(x-c)]/(x-c)(x-d)
化简(a-b)/(x-a)(x-b)=(c-d)/(x-c)(x-d)
因为a+d=b+c
所以a-b=c-d
所以(x-a)(x-b)=(x-c)(x-d)
-(a+b)x+ab=-(c+d)x+cd
(c+d-a-b)x=cd-ab
x=(cd-ab)/(c+d-a-b)
通分 [(x-b)-(x-a)]/(x-a)(x-b)=[(x-d)-(x-c)]/(x-c)(x-d)
化简(a-b)/(x-a)(x-b)=(c-d)/(x-c)(x-d)
因为a+d=b+c
所以a-b=c-d
所以(x-a)(x-b)=(x-c)(x-d)
-(a+b)x+ab=-(c+d)x+cd
(c+d-a-b)x=cd-ab
x=(cd-ab)/(c+d-a-b)