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已知|2x-y-1|+(x+y-5)2=0,则x= ,y= .
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教案备课库《七年级数学学案7.2二元一次方程组的解法(一)---代入消元法》真题及答案
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2
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x<
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<2xy
x<2xy<
已知x﹣32+|y+2|=0求4xy﹣2x2+5xy﹣y2+2x2+3xy的值.
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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
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