Вправи: 97

97. Скоротіть дріб:

1) 3x-3yx- y = 3(x- y)x- y = 3;

2) 4x+4ya(x+ y) = 4(x+ y)a(x+ y) = 4a;

3) 3x-6y2x-4y = 3(x-2y)2(x-2y) = 1,5;

4) 5a-5bb- a = –5(a- b)a- b = –5;

5) 3a-9c3c- a = –3(a-3c)a-3c = –3;

6) 4x-12y3ay- ax = 4(x-3y)a(3y- x) = –4(x-3y)x-3y = –4;

7) a2- abb2- ab = a(a- b)b(b- a) = –a(a- b)b(a- b) = –ab;

8) 2ax-2ay3bx-3bx = 2a(x- y)3b(y- x) = –2a(x- y)3b(x- y) = –2a3b.