Question

Помогите пожалуйста, от 4 до 7

Answer 1

4.  2m+8n-12+(3m-6n+5)= 2m+8n-12+3m-6n+5= 5m+2n-7
5. (5х-10у)-(6х+3у)+(4у-8х)= 5х-10у-6х-3у+4у-8х= -9х-21х

Answer 2

6. б) 3х(х-2)-5х(х+3)= 3х^2-6х-5х^2-15х= -2х^2-21х

Answer 3

3х^2 - три х в квадрате

Answer 4

4) 2m+8n-12+(3m-6n+5)=5m+2n-7
5) (5x-10y)-(6x+3y)+(4y-8x)=-9x-9y