Question

стр 31 номер 10.Упрости выражения.Найди значения при a=3,b=2,x=4​

Answer 1

$(a + b) \times 5 + 9a + 3b = 5a + 5b + 9a + 3b = 14a + 8b = 14 \times 3 + 8 \times 2 = \\ \\ = 42 + 16 = 58$

$13(a + b) - 7b + 4a = 13a + 13b - 7b + 4a = 17a + 6b = 17 \times 3 + 6 \times 2 = \\ \\ = 51 + 12 = 63$

$6(x + a) - 5a = 6x + 6a - 5a = 6x + a = 6 \times 4 + 3 = 24 + 3 = 27$

$30x - (5x + 4x) = 30x - 9x = 21x = 21 \times 4 = 84$

Answer 2

1) 58
2) 63
3) 4
4) 8
:) рада помочь