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已知集合A={(x,y)|x﹣2y=2},B={(x,y)|2x﹣y=4},则A∩B为( )
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高一上学期数学《》真题及答案
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[x﹣2y2+x﹣2yx+2y﹣2x2x﹣y]÷2x.
下列多项式相乘不能用平方差公式计算的是
(x﹣2y)(2y+x)
(﹣2y﹣x)(x+2y)
(x﹣2y)(﹣x﹣2y)
(2y﹣x)(﹣x﹣2y)
[x﹣2y2+x﹣2y2y+x﹣2x2x﹣y]÷2x.
已知集合A.={x|y=log21﹣x<1}集合B.={y|y=2xx∈A.}则A.∩B=
.已知集合M={xy|x+y=2}N={xy|x-y=4}那么集合M∩N=.
已知2x+y=4求[x﹣y2﹣x+y2+y2x﹣y]÷﹣2y的值.
已知2x﹣y=0求代数式xx﹣2y﹣x+yx﹣y的值.
已知x﹣2y=3则代数式2y﹣x2﹣2x+4y﹣1的值为.
已知4x=3y求代数式x﹣2y2﹣x﹣yx+y﹣2y2的值.
化简后求值2y﹣x﹣2y﹣x+x﹣2y2其中x=﹣1y=2.
已知集合A.={xy|x2+y2≤1xy∈Z}B.={xy||x|≤2|y|≤2xy∈R}定义集合A
已知集合P={xy|x﹣2y=3}Q={xy|3x+y=2}则P∩Q=
{﹣1,1}
{(﹣1,1)}
{(1,﹣1)}
{(﹣1,﹣1)}
计算﹣3x﹣2y+4x﹣2y的结果是
x﹣2y
x+2y
﹣x﹣2y
﹣x+2y
已知集合
={x|0≤x≤2},
={y|0≤y≤4},下列对应关系不能构成从集合A.到集合B.的映射的是( ) A.y=2xB.y=
x
y=x
2
y=4x-1
已知2x﹣y=2求〔x2+y2﹣x﹣y2+2yx﹣y〕÷4y的值.
计算﹣3x﹣2y+4x﹣2y的结果是
x﹣2y
﹣x﹣2y
x+2y
﹣x+2y
已知集合A={x|y=lg2x﹣x2}B={y|y=2xx>0}则A∩B=
下列各式①x﹣2y2y+x②x﹣2y﹣x﹣2y③﹣x﹣2yx+2y④x﹣2y﹣x+2y.其中能用平方
①②
①③
②③
②④
下列各式能用平方差公式计算的是
(x+2y)(2x﹣y)
(x+y)(x﹣2y)
(x+2y)(2y﹣x)
(x﹣2y)(2y﹣x)
计算﹣3x﹣2y+4x﹣2y的结果是
x﹣2y
x+2y
﹣x﹣2y
﹣x+2y
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