Question

раскрой скобки -15(1/3+а); -2/5*(5а+1/2в)

Answer 1

1) -15 * (1/3 + а) = - 15 * 1/3 - 15 * а = -15/3 - 15а = -5 - 15а

2) -2/5 * (5а + 1/2в) = -2*5а/5 - 2*1/5*2в = -10/5а - 2/10в = -2а - 1/5в