Question

упростите выражения:-2,4а *(-5b); 2)9a-a-8b+3b 3) a+(a-10)-(15+a) 4) -4(b-4)+7(b+2)

Answer 1

1) -2,4а * (-5b) = 12ab
2) 9a - a - 8b+3b = 8a-5b
3) a+(a-10)-(15+a) = a+a-10-15-a= a-25
4) -4(b-4)+7(b+2) = -4b+16+7b+14 = 3b+30