Question

Найди значения выражений

Answer 1

Ответ:

В примере ответ 2700

1

$(5a-3b)^{2} - (3a-5b)^{2} = (5a-3b-3a+5b)(5a-3b+3a-5b) = (2a+2b)(8a-8b) = 2(a+b)*8(a-b) = 16(a+b)(a-b)\\ a = 0.55 b = 0.05\\ 16*(0.55-0.05)(0.55+0.05) = 16*0.5*0.6 = 8*0.6 = 4.8$

2

$(8x-19y)^{2} - (19y-8x)^{2} = (8x-19y - 19y + 8x)(8x-19y + 19y - 8x) = 0*0 = 0$