Question

Упрости выражения

-5a(6x-5y)=
-4c(3x-9-7y)=
-9c(-3a+12-6b)=

Answer 1

$1) - 5a(6x - 5y) = - 30ax + 25ay \\ 2) - 4c(3x - 9 - 7y) = - 12cx + 36c + 28cy \\ 3) - 9c( - 3a + 12 - 6b) = 27ac - 108c + 54cb$