合并下列各式的同类项

(1)1/2n+3/5n^2-0.4n^2

(2)3x-4x^2+7-3x^2+2x-1

(3)2x^2y+5xy^2-3X^2y^2-4xy2

(4)4ab-3a^2-ab+b^2+a^2-3ab-2b+2a^2

(1)=1/2n+0.2n*2=n(1/2+0.2n)

(2)=-7x*2+5x+6

(3)=xy*2+2x^2y-3X^2y^2=xy(y+2x-3xy)

(4)=b^2-2b=b(b-2)

(1)原式=1/2n+(3/5-0.4)n^2=1/2n+1/5n^2

(2)原式=(-4-3)x^2+(3+2)x+(7-1)=-7x^2+5x+6

(3)原式=-3x^2y^2+2x^2y+(5-4)xy^2=-3x^2y^2+2x^2y+xy^2

(4)原式=(-3+1+2)a^2+(4-1-3)ab+b^2+2b=b^2+2b

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