(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
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(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
(3x2y-2xy2)-(xy2-2x2y)
=5x^2y-3xy^2
=xy(5x-3y)
=-1x2x(-5-6)
=22
-3x2+2x2y+xy2
3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)]
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
-3x2y+2x2y+3xy2-2xy2
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
-2x2y(-2xy2)2+(2xy)3×( xy2)
(X3-2x2y+xy2)÷(x3-xy2)要求约分
化简-x2-3x+2x2+4x.xy2-2/3x2y-xy2/2+2x2y.2a-1/2ab-(a2-ab)
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求[2(x2y-xy2)+xy(2xy-x2)]÷x2y注:x2 xy2 x2y中的2是平方,我不会打平方的符号
(-1/2x2y)`(-3xy2)=
4xy2-4x2y-y3 (2 3 是方)
x3-2x2y+xy2-x
因式分解:x3-2x2y+xy2
(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-(3xy-xy2)-3x2】-2xy2-y2的值.
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-(3xy-xy2)-3x2】-2xy2-y2的值.
x.y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3).y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)的值都是常数?