Вправи: 437

437. Виконайте дію:

1) 2c-72c+5 + 4-cc+5 = 2c-7+8-2c2(c+5) = 12(c+5);

2) a-13a+6 – a4a+8 = a-13(a+2) – a4(a+2) = 4a-4+3a12(a+2) = a-412(a+2);

3) 7x – 14x(x+2) = 7x+14-14x(x+2) = 7xx(x+2) = 7x+2;

4) 9m2+ 4m – 5m+4 = 9m(m+4) – 5m+4 = 9-5mm(m+4);

5) ba2- b2 + 1a+b = ba-b(a+b) + 1a+b = b+a-ba-b(a+b) = aa2- b2;

6) x+3x2+ 2x+1 – 1x+1 = x+3-x-1(x+1)2 = 2(x+1)2.