因式分解的简单应用 (21 18:50:51)

题目

因式分解的简单应用 (21 18:50:51)
1.     （x2+2xy+y2)/(x+y)
2.      [(a-b)2+2(b-a)]/(a-b)
3.       (ab2+a2b)/(a+b)
4.        (x2-49)/7-x)
5.        (4mn3+6m3n)/(2n2+3m2)
6.         [(2a-1)2-(3a-1)2]/(5a-2)

答案

1.（x2+2xy+y2)/(x+y) =(x+y)^2/(x+y)=x+y2.[(a-b)2+2(b-a)]/(a-b) = (a-b)-23.(ab2+a2b)/(a+b)=ab(b+a)/(a+b)=ab4.(x2-49)/(7-x) =(x-7)(x+7)/(7-x)=-(x+7)5.(4mn3+6m3n)/(2n2+3m2)=2mn(2n^2+3m^2)/(2n^2+3m^2)=2mn...