Question

初中数学化简化简1.3x/(x-3)²-x/3-x2.x²+xy/x-y÷xy/x-y3.(a/a-

Answer 1

1.3x/(x-3)²-x/3-x =3x/(x-3)²+x/(x-3)=3x/(x-3)²+(x²-3x)/(x-3)²=x²/(x-3)².

2.x²+xy/x-y÷xy/x-y =x（x+y)/x-y×（x-y)/xy=(x+y)/y.

3.(a/a-1-2/a-1)÷(1-1/a+1) =(a-2/a-1)×（a+1)/a=(a-2)(a+1)/a(a-1).

4.(b/a²-ab+a/b²-ab)÷a-b/ab=(b²-a²）/（a-b)²=(a+b)/(b-a).