Question

Упростите выражения 1) -2,4а*(-5b) 2) 9a-a-8b-3b 3) a+(a-10)-(15+a) 4) -4*(b-4)+7*(b+2)

Answer 1

1) 2,4a*5b = 12ab
2) 8a-11b
3) a+a-10-15-a = a-10-15 = a - 25
4) -4b+16+7b-14 = 3b+30

Answer 2

1. -2.4a * (-5b) = 12ab

2. 9a - a - 8b - 3b = 8a - 11b

3. a + (a - 10) - (15 + a) = a + a - 10 - 15 - a = -10 - 15 = -25

4. -4 * (b - 4) + 7 * (b + 2) = -4b + 16 + 7b + 14 = 3b + 30