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计算:5x·(x2)·(-xy2)·(-x2y2)
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教案备课库《八年大班数学学案12.2.1单项式乘以单项式》真题及答案
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4x2y﹣3xy﹣5x2y﹣2xy
下列计算正确的是
(﹣2xy)
2
=﹣4x
2
y
2
x
6
÷x
3
=x
2
(x﹣y)
2
=x
2
﹣y
2
2x+3x=5x
下列计算正确的是
(xy)
3
=xy
3
x
5
÷x
5
=x
3x
2
•5x
3
=15x
5
5x
2
y
3
+2x
2
y
3
=10x
4
y
9
﹣xy2x+y3+xx+y2的公因式是
计算3xy2·-5x3y=_______________.
已知x+y=2xy=﹣1求下列代数式的值15x2+5y22x﹣y2.
下列合并同类项正确的是
3x+y=4xy
2x
2
+3x
2
=5x
4
6x
2
﹣3x
2
=3
5xy﹣3xy=2xy
先化简再求值.5x2-3y2+5x2+4y2+7xy其中x=-1y=1.
下列计算正确的是
-3x
2
y·5x
2
y=2x
2
y
-2x
2
y
3
·2x
3
y=-2x
5
y
4
35x
3
y
2
÷5x
2
y=7xy
(-2x-y)(2x+y)=4x
2
-y
2
计算5x2y·-3xy3=.
下列计算中正确的是
2x+3y=5xy
3x﹣x=3
2x+3x=5x
2
﹣x
2
﹣x
2
=﹣2x
2
先化简再求值﹣35x2+xy+2x2+xy﹣1其中x=﹣1y=﹣2.
甲乙两种化合物都只含XY两种元素甲乙中X元素的百分含量分别为30.4%和25.9%.若已知甲的分子式
XY
X
2
Y
X
2
Y
3
X
2
Y
5
数控铣床在进给系统中采用步进电机通过步进电机实现的对应关系和精确程度
x与y
Δx与Δy
xy与x2y2
化简求值5x2y﹣[3xy2+7x2y﹣xy2]其中x=﹣1y=2.
已知x2+y2=7xy=-2.求5x2-3xy-4y2-11xy-7x2+2y2的值.
下列各项中去括号正确的是
x
2
﹣2(2x﹣y+2)=x
2
﹣4x﹣2y+4
﹣3(m+n)﹣mn=﹣3m+3n﹣mn
﹣(5x﹣3y)+4(2xy﹣y
2
)=﹣5x+3y+8xy﹣4y
2
ab﹣5(﹣a+3)=ab+5a﹣3
先化简再求值2xy﹣4xy﹣8x2y2+23xy﹣5x2y2其中xy满足x﹣12+|y+2|=0.
若x+y=-1则x4+5x3y+x2y+8x2y2+xy2+5xy3+y4的值等于
)0 (
)-1 (
)1 (
)3
下列各组单项式的和仍为单项式的是
5x
2
y与﹣2xy
﹣5x
2
y与πx
2
y
5a
2
y与3x
2
y
2
3
与x
3
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