Question

Упростите выражение: 1) -2,4m•(-3n) 2) -8a-12b+5a+17b 3) a-(a+5)+(-7+a) 4) -5(y-4)+(y+5)

Answer 1

1) 7,2mn
2) -3a+5b
3)-12+a
4)-4y+25

Answer 2

1. -2,4m • (-3n) = 7,2mn

2. -8a - 12b + 5a + 17b = -3a + 5b

3. a - (a + 5) + (-7 + a) = a - a - 5 - 7 + a = 2a - 12

4. -5(y - 4) + (y + 5) = -5y + 20 + y + 5 = -4y + 25