1) a^2+ab+ba-b^2=a^2+2ab+b^2 (^2-степень)
2) 2a^2-2a^2+5ab-2ab+b^2=3ab+b^2
3) 30a^2+15ab-30ab+12a^2=42a^2-15ab
4) 8m^2+8mn-6mn+12n^2=8m^2+2mn+12n^2
1)а(а+b)+b(a-b)=a2 + ab + ab – b2 =a2 + 2ab– b2
2)a2 - a(2a-5b)-b(2a-b)= 2a2 - 2a2 +5ab – 2ab + b2= b2 + 5ab – 2ab
3)5a(6a+3b)-6a(5b-2a)=30a2 + 15ab – 30ab+12a2=42a2-15ab
4)8m(m+n)-3n(2m-4n)=8m2+8mn – 6mn+12n2=8m2+2mn+12n2
1) a^2+ab+ba-b^2=a^2+2ab+b^2 (^2-степень)
2) 2a^2-2a^2+5ab-2ab+b^2=3ab+b^2
3) 30a^2+15ab-30ab+12a^2=42a^2-15ab
4) 8m^2+8mn-6mn+12n^2=8m^2+2mn+12n^2
1)а(а+b)+b(a-b)=a2 + ab + ab – b2 =a2 + 2ab– b2
2)a2 - a(2a-5b)-b(2a-b)= 2a2 - 2a2 +5ab – 2ab + b2= b2 + 5ab – 2ab
3)5a(6a+3b)-6a(5b-2a)=30a2 + 15ab – 30ab+12a2=42a2-15ab
4)8m(m+n)-3n(2m-4n)=8m2+8mn – 6mn+12n2=8m2+2mn+12n2