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(a+b)2=a2+b 2 (a-b)2=a2-b 2 (a+m)(b+n)=ab+mn (m+n)(-m+n)=-m2+n 2
2m2n-3mn+n2 2n2-3mn2+n2 2m2-3mn+n2 2m2-3mn+n
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
-8m3+12m2-4m=-4m(2m2+3m-1) m2+5n-mn-5m=(m-5)(m-n) 5m2+6mn-8n2=(m+2n)(5m-4n) 0.04a2+0.12ab+0.09b2=(0.2a+0.3b)2
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
x2﹣2(2x﹣y+2)=x2﹣4x﹣2y+4 ﹣3(m+n)﹣mn=﹣3m+3n﹣mn ﹣(5x﹣3y)+4(2xy﹣y2)=﹣5x+3y+8xy﹣4y2 ab﹣5(﹣a+3)=ab+5a﹣3
,则A.表示的多项式是( ) A.m2+n2 m2-mn+n2 m2-3mn+n2 m2+mn+n2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
3x+x=3x2 x4·x2=x8 3ab-2ab=ab (m2+2mn+n2)÷(m+n)=m-n
2m2n-3mn+n2 2m2-3mn2+n2 2m2-3mn+n2 2m2-3mn+n
(m+n)2+2mn m2+n2+2mn m2+n2+2m2n2 2(m2+n2+mn)