Предмет: Алгебра, автор: vikabulgakova97

6(2а-5b)-7(-4b-a) при а =1 b=-2,4 упростить и решить

Ответы

Автор ответа: Аноним

11

6 ( 2а - 5b ) - 7 ( -4b - a ) = 12a - 30b + 28b + 7a =
= 19a - 2b = (19× 1) - (2× (-2,4)) = 19 + 4,8 = 23,8.
Ответ : 23,8.
Удачи))))

Автор ответа: kumamon15

3

открываем скобки
12а-30b+28b+7a
19a-2b
a=1 b=-2,4
19×1-2×(-2,4)
19+4,8=23,8

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