Решите уравнение: а) 8m(1 + 2m) - (4m + 3)(4m - 3) - вопрос №81243432949690 от Senenadasha2017 15.08.2021 07:21

Question

Другие предметы: Решите уравнение: а) 8m(1 + 2m) - (4m + 3)(4m - 3) = 2m; б) х - 3х(1 - 12y) = 11 - (5 - 6x)(6х + 5).

Senenadasha2017 · Answer

a) 8m • (1 + 2m) - (4m + 3)(4m - 3) = 2m => 8m + 16m^2 - (16m^2 - 9) = 2m => 6m + 9 = 0 => 6m = - 9 => m = -1,5;
6) х - 3х • (1 - 12y) = 11 - (5 - 6x)(6х + 5) => x - 3x + 36x2 = 11 - (25 - 36x^2) => -2x + 36x^2 - 36x^2 = 11 - 25 => -2x = -14 => x = 7.