Вправи 501 - 600 » 555

Виконайте множення многочленів: 1) (m – n)(m + n) = m2 – n2; 2) (х – 1)(х + 1) = х2 – 12 = х2 – 1; 3) (9 –y)(9 + у) = 92 – у2 = 81 – у2; 4) (3b – 1)(3b + 1) – (3b)2 – 12 = 9b2 – 1; 5) (10m – 7)(10m + 7) = (10m)2 – 72 = 100m2 – 49; 6) (4а – b)(b + 4a) = (4а – b)(4a + b) = (4a)2 – b2 = 16a2 – b2; 7) (5b + 1)(1 – 5b) = (1 + 5b)(1 – 5b) = 12 – (5b)2 = 1 – 25b2; 8) (3x – 5y)(3x + 5y) = (3x)2 – (5y)2 = 9x2 – 25y2; 9) (13c– 10d)(13c + 10d) = (13c)2 – (10d)2 = 169c2 – 100d2; 10) (8m + 11n)(11n – 8m) = (11n + 8m)(11n – 8m) = (11n)2 – (8m)2 = 121n2 – 64m2.