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若x+y=5,xy=3,则x2+y2=
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教案备课库《七年级数学作业13.3.2两数和的平方》真题及答案
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已知A.=5x2y-3xy2+4xyB.=7xy2-2xy+x2y试解答下列问题1求A.-2B.的值
因式分解:-x4y5+x2y2-xy=-xyx3y4-xy
若x是方程4﹣4x﹣3=29﹣x的解y是方程62y﹣5+20=41﹣2y的解求2﹣3xy+x2﹣[2
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
若x+22+|y-1|=0求4xy-2x2+5xy-y2+2x2+3xy的值.
若|x+y﹣4|+xy﹣32=0求x2+3xy+y2的值
若x+22+|y-1|=0求4xy-2x2+5xy-y2+2x2+3xy的值.
若□×3xy=3x2y则□内应填的单项式是
xy
3xy
x
3x
若x﹣y=2xy=3则x2y﹣xy2=
先化简再求值.4xy﹣[x2+5xy﹣y2﹣2x2+3xy﹣y2]其中x=﹣1y=2.
若x+y=3且x+2y+2=12.1求xy的值2求x2+3xy+y2的值.
若□×3xy=3x2y则□内应填的单项式是
xy
3xy
x
3x
下列关于化学反应X2十3Y2===2Z的叙述错误的是
Z.的化学式为XY3
若mg X2和ngY2恰好完全反应,则生成(m+n)gZ.
若X2和Y2的相对分子质量分别为M.和N.,则Z.的相对分子质量为(M+N)
若ag X2完全反应生成bgZ.,则同时消耗(a一b)g Y2
已知xy2=2求-xyx2y5-xy3-y
已知x﹣32+|y+2|=0求4xy﹣2x2+5xy﹣y2+2x2+3xy的值.
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
下列运算中正确的是
2x+2y=2xy
(x
2
y
3
)
2
=x
4
y
5
(xy)
2
÷
=(xy)
3
2xy﹣3yx=xy
下列运算中正确的是
2x+2y=2xy
(x
2
y
3
)
2
=x
4
y
5
(xy)
2
÷
=(xy)
3
2xy﹣3yx=xy
若x+y=5xy=10则x2y+xy2=_______
若x+y=-1则x4+5x3y+x2y+8x2y2+xy2+5xy3+y4的值等于
)0 (
)-1 (
)1 (
)3
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