Question

Упрости 1) -2,4a×(-5в)= 2) 9a-a-8в+3в= 3) a+(a-10)-(15+a)= 4) -4(в-4)+7(в+2)=

Answer 1

1) = 12ab
2) = 8a - 5b
3) = a - 25
4) = 3b + 30