пжжжжж памагитиииии​

Ответ:

1) а(а-2b)-3b+a)=a²-2ab-3b-a

2 (m+8)^2-(m-2n)(m+2n)=m²+16m+64-m²+4n²=4n²+16m+64

3) 3(b-10)^2+8b-5b^2=3b²-60b+300+8b-5b²=300-52b-2b²

4) (n+15)^2-n(n-19)=n²+30b+225-n²+19n=49n+225

5) 4c(9c-3)-(6c+1)^2=36c²-12c-36c²-12c-1=-24c-1

6) -4)^2=36-25m²+25m²-40m+16=52-40