Вправи: 1095

1095. Знайди суму і різницю дробів:

б) 16a2-13a+6 + 13a2- 11a+6 = 16a-1,5(a- 23) + 13a-3(a- 23) = a-3+2(a-1,5)6a-1,5a- 23(a-3) = a-3+2a-36a-1,5a- 23(a-3) = 3a-62a-33a-2(a-3) = 3(a-2)2a-33a-2a-3;

16a2- 13a+6 – 13a2- 11a+6 = 12a-3(3a-2) – 1a-3(3a-2) = a-3-2a+32a-33a-2(a-3) = a2a-33a-2(a-3).

a = 13 ± 169-14412 = 13 ±512; a₁ = 1812 = 1,5; a₂ = 812 = 23;

a’ = 11 ± 121-7212 = 11 ±712; a1' = 186 = 3; a2' = 46 = 23;