一.合并下列同类项1.x^2y-3xy^2+2yx^2-y^2x2.-(5x-y-2z)-3[4x-(x-y-z))+2y]3.2(a+b)^2-(3a+3b)-3(a+b)^2-2(a+b)4.1/9x^n-(4x^n+1)+(x^n+1)-1/2x^n二.求值（先化简,在求值）1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7

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一.合并下列同类项1.x^2y-3xy^2+2yx^2-y^2x2.-(5x-y-2z)-3[4x-(x-y-z))+2y]3.2(a+b)^2-(3a+3b)-3(a+b)^2-2(a+b)4.1/9x^n-(4x^n+1)+(x^n+1)-1/2x^n二.求值（先化简,在求值）1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7
一.合并下列同类项
1.x^2y-3xy^2+2yx^2-y^2x
2.-(5x-y-2z)-3[4x-(x-y-z))+2y]
3.2(a+b)^2-(3a+3b)-3(a+b)^2-2(a+b)
4.1/9x^n-(4x^n+1)+(x^n+1)-1/2x^n
二.求值（先化简,在求值）
1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7

一.合并下列同类项1.x^2y-3xy^2+2yx^2-y^2x2.-(5x-y-2z)-3[4x-(x-y-z))+2y]3.2(a+b)^2-(3a+3b)-3(a+b)^2-2(a+b)4.1/9x^n-(4x^n+1)+(x^n+1)-1/2x^n二.求值（先化简,在求值）1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7
一.合并下列同类项
1.x^2y-3xy^2+2yx^2-y^2x
=(X^2Y+2yx^2)-(3xy^2+xy^2)
=3x^2y-4xy^2
2.-(5x-y-2z)-3[4x-(x-y-z))+2y]
=-5x+y+2z-3[4x-x+y+z+2y]
=-5x+y+2z-9x-9y-3z
=-14x-8y-z
3.2(a+b)^2-(3a+3b)-3(a+b)^2-2(a+b)
=-(a+b)^2-5(a+b)
4.1/9x^n-(4x^n+1)+(x^n+1)-1/2x^n
=[1/9-1/2]x^n-3x^(n+1)
=--7/18x^n-3x^(n+1)
二.求值（先化简,在求值）
1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7
=x^3+x^2+x+7
把X=?代进去就行了.

合并下列同类项,-xy+x+4xy-y 合并同类项 -3x²y+2x²y+3xy²-2xy² （5x-4y-3xy）+（8x+y-2xy)合并同类项 5xy平方+3x平方y-xy平方-2x平方y-1 合并同类项合并同类项：(2xy²+3xy²)-(6x²y-3xy²) 关于合并同类项的数学题合并同类项-3（2x-xy)+4(x+xy-6)=? 2x²y+3xy²+5xy-6yx+2 合并同类项合并同类项 2x的平方y+3xy的平方+5xy-6yx+2 -x^2y+5xy^2-yx^2合并同类项合并下列各式的同类项 1.-(5x-y-2z)-3[4x-(x-y-z)+2y] 3x+2y合并同类项 -xy+x+4xy-y合并同类项,2a的平方b-4ab的平方+3a的平方b+3ab的平方合并同类项合并同类项x的平方y一3xy的平方＋2yx的平方一y的平方x -2y^3+(3xy^2-x^2y)-2(xy^2-y^3)去括号合并同类项合并同类项-7x^2y-5xy^2-4x^2y+3xy^2（现在就要!）合并同类项3x的平方y+4xy的平方-2x的平方y-3xy的平方合并同类项 -2x立方y-3xy立方+4yx立方合并同类项3x*x-2xy*y-10xy*x+4假如不能合了,就说明