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计算:[xy(2x²y-xy²)-y(3x²y²)+x³y]÷2x²y
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下列计算正确的是
(﹣2a
2
b
3
)÷(﹣2ab)=a
2
b
2
(3x
2
y﹣6xy)÷6xy=0.5x
(21x
5
y
2
﹣9x
4
y
3
)÷3x
3
y
2
=7x
2
﹣3xy
(3x
2
y+xy)÷xy=3x
化简与计算1已知多项式A.=2x2﹣xyB.=x2+xy﹣623x2y﹣|2xy2﹣2xy﹣3x2y
多项式x5y2+2x4y3-3x2y2-4xy是
按x的升幂排列
按y的升幂排列
按x的降幂排列
按y的降幂排列
多项式x5y2+2x4y3﹣3x2y2﹣4xy是
按x的升幂排列
按x的降幂排列
按y的升幂排列
按y的降幂排列
有这样一道题计算2x3﹣3x2y﹣x3﹣2xy2+y3+﹣x3+4x2y﹣y3的值其中x=2y=﹣1
已知x+22+│x+y+5│=0求3x2y+{-2x2y—[—2xy+x2y+4x2-xy]的值.
抛物线y=3x2+2x﹣1向上平移4个单位长度后的函数解析式为
y=3x
2
+2x﹣5
y=3x
2
+2x﹣4
y=3x
2
+2x+3
y=3x
2
+2x+4
先化简再求值2x³-3x²y-2xy²-x³-2xy²+y²+-x³+3x²y-y²其中x=2019
下列分解因式正确的是
3x
2
﹣6x=x(3x﹣6)
﹣a
2
+b
2
=(b+a)(b﹣a)
4x
2
﹣y
2
=(4x+y)(4x﹣y)
4x
2
﹣2xy+y
2
=(2x﹣y)
2
下列计算正确的是
3a
2
+a
2
=3a
4
8xy﹣7xy=xy
3x
2
y﹣xy
2
=2x
2
y
3a+b=3ab
已知函数的全微分dfxy=3x2+4xy-y2+1dx+2x2-2xy+3y2-1dy则fxy=__
一个多项式
与多项式
=2x
2
-3xy-y
2
的和是多项式
=x
2
+xy+y
2
,则A.等于( ) A. x
2
-4xy-2y
2
B. -x
2
+4xy+2y
2
C. 3x
2
-2xy-2y
2
3x
2
-2xy
计算2x3-3x2y-2xy2-x3-2xy2+y3+-x3+3x2y-y3的值其中x=0.5y=-
先化简再求值3x2y-2xy2-xy2-2x2y其中x=-1y=2.
计算[xx2y2+xy-yx2-x3y]÷3x2y
下列计算中不正确的是
﹣2x+3x=x
6xy
2
÷2xy=3y
(﹣2x
2
y)
3
=﹣6x
6
y
3
2xy
2
•(﹣x)=﹣2x
2
y
2
试说明无论xy取何值时代数式x3+3x2y﹣5xy+6y3+y3+2xy2+x2y﹣2x3﹣4x2y
有这样一道计算题计算2x3-3x2y-2xy2-x3-2xy2+y3+-x3+3x2y-y3的值其中
有这样一道题计算2x3-3x2y-2xy2-x3-2xy2+y3+-x3+3x2y-y3的值其中x=
先化简再求值3xy﹣[2x2+4xy﹣2y2﹣3x2+2xy﹣4y2]其中x=3y=﹣.
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