初中数学化简

问题描述:

初中数学化简
化简
1.3x/(x-3)²-x/3-x
2.x²+xy/x-y÷xy/x-y
3.(a/a-1-2/a-1)÷(1-1/a+1)
4.(b/a²-ab+a/b²-ab)÷a-b/ab
希望快些
这个麻烦些
不过我会有奖励的

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...