1.x2y2 - 2x2y - 3xy2 2.– 3a2x2 + 3ax2 - 6ax33.- 3m2n2 – 3mn2 - 9mn 4.x(x - y) + y(y - x) 5.9a2 - 4b2 6.(x + a)2 - (x – a)2 7.b2 – 6b + 9 8.m2 – 8mn + 16n29 (a + b)2 + 2(a + b) + 1 10 .ax2 - 2axy + ay2
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3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)]
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
-3x2y+2x2y+3xy2-2xy2
-3x2+2x2y+xy2
-2x2y(-2xy2)2+(2xy)3×( xy2)
(x2y)3 × (-xy2)3
(-4x2y)×(-x2y2)×(y3) (2,3是次方)
化简:5(3x2y-xy2) * (xy2+3x2y)
x3-2x2y+xy2-x
因式分解:x3-2x2y+xy2
先化简,再求值:3x2y2-[5xy2-(4xy2-3)+2x2y2],其中x=-3,y=2.
(6x2y-xy2-1/2x2y3)/(-3xy)
(-1/2x2y)`(-3xy2)=
4xy2-4x2y-y3 (2 3 是方)
(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
X元素原子最外层有2个电子,Y元素原子最外层有7个电子,X和Y形成的化合物为1 XY 2 XY2 3 X2Y 4 X2Y2
若m=x3-3x2y+2xy2+3y2 n=x3-2x2y+xy2-5y3,则2x3-7x2y+5xy2+14y2等于( )若m=x3-3x2y+2xy2+3y2 n=x3-2x2y+xy2-5y3,则2x3-7x2y+5xy2+14y2等于( )空里用字母表示
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?