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Ab + a = ba + b
a = ba - ab + b = b
1a + 1b = 2b ( или 2а )
(a+4)² - (b+2)² = (a+4 - (b+2))(a+4 + b+2) =
= (a+4 - b - 2)(a+b + 6) = (a-b +2)(a+b+6)
(13t -9)² - (8t -7)² = (13t -9 - (8t-7)) (13t -9 + 8t-7) =
= (13t - 9 - 8t + 7)(21t - 16) = (5t - 2)(21t - 16)
Ответ:
Объяснение:
3,5*2³ - 3^4= 3.5*8-81 = 28-81 = -53