若2x−y+|y+2|=0
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若
+|y+2|=0
2x−y |
![若2x−y+|y+2|=0](/uploads/image/z/2257896-48-6.jpg?t=%E8%8B%A52x%E2%88%92y%2B%7Cy%2B2%7C%EF%BC%9D0)
∵
2x−y+|y+2|=0,
∴y+2=0,2x-y=0,
解得:x=-1,y=-2;
∴[(x-y)2+(x+y)(x-y)]÷2x,
=[(x-y)(x-y+x+y)]÷2x,
=[(x-y)×2x]÷2x,
=x-y,
当x=-1,y=-2时,
原式=x-y,
=-1+2,
=1.
2x−y+|y+2|=0,
∴y+2=0,2x-y=0,
解得:x=-1,y=-2;
∴[(x-y)2+(x+y)(x-y)]÷2x,
=[(x-y)(x-y+x+y)]÷2x,
=[(x-y)×2x]÷2x,
=x-y,
当x=-1,y=-2时,
原式=x-y,
=-1+2,
=1.
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