Question

Oblicz :

0,2(5a+10b)-7(0,1a-b)+a-b=

8a(a-b)-2(a do kwadratu - 4ab) =

a+(-a+b-c)-(-b+c+a)=

Answer 1

1.  0,2(5a+10b)-7(0,1a-b)+a-b= a+2b-0,7a+7b+a-b=1,3a+8b

2. 8a(a-b)-2(a^2- 4ab) =8a^2-8ab-2a^2+8ab=6a^2

3. a+(-a+b-c)-(-b+c+a)=a-a+b-c+b-c-a=2b-2c-a

Answer 2

1a+2b-0,7a+7b+a-b=1,3a+8b

8a2-8ab-2a2-4ab=6a2-12ab=6a(a-2b)

a-a+b-c+b-c-a=-a+2b-2c