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8x+10y-8x+2y-3y=
(4a+2b)-2(b+a)=
3a2(do kwadratu) +4a2-7a2b-6a2=
(a+2)*(a-2)+4a
4a2-(-2a+10a2)
5xy-(x+y)*(x-2y)=
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8x+10y-8x+2y-3y=9y
(4a+2b)-2(b+a)=4a+2b-2b-2a=2a
3a2(do kwadratu) +4a2-7a2b-6a2=7a2-7a2b-6a2
(a+2)*(a-2)+4a=a2-4+4a
4a2-(-2a+10a2)=4a2+2a-10a2=2a-6a2
5xy-(x+y)*(x-2y)=5xy-x2-4y2
8x+10y-8x+2y-3y= 9y
(4a+2b)-2(b+a)= 4a+2b-2b-2a = 2a
3a2+4a2-7a2b-6a2= a2-7a2b
(a+2)*(a-2)+4a= a2-2a+2a-4+4a= a2+4a-4
4a2-(-2a+10a2)= 4a2+2a-10a2 = -6a2+2a
5xy-(x+y)*(x-2y)= 5xy-x2-2xy+xy-2y2 =4xy-x2-2y2