几道初一合并同类项的题.各位高手,帮帮忙吧!-0.8a²b-6ab-1.2a²b+5ab+a²b2/3a²-1/2ab+3/4a²+ab-b²6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y4x²y-8xy²+7-4x²y+12xy²-43xm+3

几道初一合并同类项的题.各位高手,帮帮忙吧!-0.8a²b-6ab-1.2a²b+5ab+a²b2/3a²-1/2ab+3/4a²+ab-b²6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y4x²y-8xy²+7-4x²y+12xy²-43xm+3
几道初一合并同类项的题.各位高手,帮帮忙吧!
-0.8a²b-6ab-1.2a²b+5ab+a²b
2/3a²-1/2ab+3/4a²+ab-b²
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y
4x²y-8xy²+7-4x²y+12xy²-4
3xm+3-9xm+2+5xm+1+7xm+2-10xm+3-5xm+1(m+1 m+2 m+3为字母指数）
2(x-3y)²-3(x-3y)³-(3y-x)²-(3y-x)³
尽量快点,我会追加分的,最好有过程!谢谢了^_^

几道初一合并同类项的题.各位高手,帮帮忙吧!-0.8a²b-6ab-1.2a²b+5ab+a²b2/3a²-1/2ab+3/4a²+ab-b²6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y4x²y-8xy²+7-4x²y+12xy²-43xm+3
-0.8a²b-6ab-1.2a²b+5ab+a²b=-a²b-ab
2/3a²-1/2ab+3/4a²+ab-b²=17/12a²+1/2ab-b²
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y=-3xy-7x²y²-7x
4x²y-8xy²+7-4x²y+12xy²-4=4xy²+3
3x^(m+3)-9x^(m+2)+5x^(m+1)+7x^(m+2)-10x^(m+3)-5x^(m+1)=-7x^(m+3)-2x^(m+2)
2(x-3y)²-3(x-3y)³-(3y-x)²-(3y-x)³=2(x-3y)²-3(x-3y)³-(x-3y)²+(x-3y)³=(x-3y)²-2(x-3y)³

-0.8a²b-6ab-1.2a²b+5ab+a²b=-8.2a²b-ab
2/3a²-1/2ab+3/4a²+ab-b²=17/12a²+1/2ab-b²
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y=x&sup...

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-0.8a²b-6ab-1.2a²b+5ab+a²b=-8.2a²b-ab
2/3a²-1/2ab+3/4a²+ab-b²=17/12a²+1/2ab-b²
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y=x²y²(-3-4)-3xy-7x=-7x²y²-3xy-7x
4x²y-8xy²+7-4x²y+12xy²-4=4xy²+3
3xm+3-9xm+2+5xm+1+7xm+2-10xm+3-5xm+1(m+1 m+2 m+3为字母指数）=xm+3
(3-10)+xm+2(-9+7)+xm+1(5-5)=-7xm+3-2xm+2
2(x-3y)²-3(x-3y)³-(3y-x)²-(3y-x)³=2(x-3y)²-3(x-3y)³+(x-3y)²+(x-3y)³=3(x-3y)²-2(x-3y)³

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-0.8a²b-6ab-1.2a²b+5ab+a²b
=a^2b(1-0.8-1.2)+ab(5-6)
=-a^2b-ab
=-ab(a+1)
2/3a²-1/2ab+3/4a²+ab-b²
=a^2(2/3+3/4)+ab(1-1/2)-b^2
=17/12a^2-b^2+1/2ab

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-0.8a²b-6ab-1.2a²b+5ab+a²b
=a^2b(1-0.8-1.2)+ab(5-6)
=-a^2b-ab
=-ab(a+1)
2/3a²-1/2ab+3/4a²+ab-b²
=a^2(2/3+3/4)+ab(1-1/2)-b^2
=17/12a^2-b^2+1/2ab
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y
=-3xy-7x^2y^2-7x
=-xy(3+xy+7)
4x²y-8xy²+7-4x²y+12xy²-4
=4xy^2+3
3xm+3-9xm+2+5xm+1+7xm+2-10xm+3-5xm+1
=x^m(3x^3-9x^2+5x+7x^2-10x^3-5x)
=-x^m(7x^3+2x^2)
=-x^(m+2)(7x+2)
2(x-3y)²-3(x-3y)³-(3y-x)²-(3y-x)³
=(x-3y)^2(2-3x+9y)-(3y-x)^2(1+3y-x)
=(x-3y)^2(2-3x+9y-1-3y+x)
=(x-3y)^2(1-2x+6y)

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