Question

1.(b-a)^2/ab-(a+b)^2/ab 2.(2a+b/a-2b)-(a+4b/a-2b)+(a-b/a-2b) 3.(x+5/x-3)+(x^2/3-x)-(4-x/3-x)

急..........求

Answer 1

一.(b-a)^2/ab-(a+b)^2/ab
=[(b-a)^2-(a+b)^2]/ab
=(b^2-2ab+a^2-a^2-2ab-b^2)/ab
=(-4ab)/ab
=-4
二.(2a+b/a-2b)-(a+4b/a-2b)+(a-b/a-2b)
=（2a-a+a）+(-2b+2b-2b)+(b/a-4b/a-b/a)
=2a-2b-4b/a
三.(x+5/x-3)+(x^2/3-x)-(4-x/3-x)
=[-(x+5)+x^2-(4-x)]/(3-x)
=(x^2-9)/(3-x)
=-(3-x)(3+x)/(3-x)
=-3-x

Answer 2

1、化简得-4
2、化简得2
3、(x-1)(x+1)/(x-3)