Упростите выражение А) (5m-7bc+2)-(3m+7bc+2) Б)3a/5(a/7-3)+8a/5

Question

Упростите выражение
А) (5m-7bc+2)-(3m+7bc+2)
Б)3a/5(a/7-3)+8a/5

Answer 1

А) (5m-7bc+2)-(3m+7bc+2) =5m-7bc+2- 3m - 7bc - 2 = 2m -14bc


Б)3a/5(a/7-3)+8a/5 = a/5[(3a/7 - 9) +8] = a/5(3a/7-1)