Question

упрости выражения

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

Answer 1

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