已知(4x-2y-1)的平方+根号下(xy-2)=0,求4x的平方y-4x的平方y的平方-xy的平方已知(4x-y-1)²+根号下(xy-2)=0求4x²y-4x²y²-xy²
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![已知(4x-2y-1)的平方+根号下(xy-2)=0,求4x的平方y-4x的平方y的平方-xy的平方已知(4x-y-1)²+根号下(xy-2)=0求4x²y-4x²y²-xy²](/uploads/image/z/646703-71-3.jpg?t=%E5%B7%B2%E7%9F%A5%284x-2y-1%29%E7%9A%84%E5%B9%B3%E6%96%B9%2B%E6%A0%B9%E5%8F%B7%E4%B8%8B%EF%BC%88xy-2%EF%BC%89%3D0%2C%E6%B1%824x%E7%9A%84%E5%B9%B3%E6%96%B9y-4x%E7%9A%84%E5%B9%B3%E6%96%B9y%E7%9A%84%E5%B9%B3%E6%96%B9-xy%E7%9A%84%E5%B9%B3%E6%96%B9%E5%B7%B2%E7%9F%A5%EF%BC%884x-y-1%EF%BC%89%26%23178%3B%2B%E6%A0%B9%E5%8F%B7%E4%B8%8B%EF%BC%88xy-2%EF%BC%89%3D0%E6%B1%824x%26%23178%3By-4x%26%23178%3By%26%23178%3B-xy%26%23178%3B)
已知(4x-2y-1)的平方+根号下(xy-2)=0,求4x的平方y-4x的平方y的平方-xy的平方已知(4x-y-1)²+根号下(xy-2)=0求4x²y-4x²y²-xy²
已知(4x-2y-1)的平方+根号下(xy-2)=0,求4x的平方y-4x的平方y的平方-xy的平方
已知(4x-y-1)²+根号下(xy-2)=0
求4x²y-4x²y²-xy²
已知(4x-2y-1)的平方+根号下(xy-2)=0,求4x的平方y-4x的平方y的平方-xy的平方已知(4x-y-1)²+根号下(xy-2)=0求4x²y-4x²y²-xy²
本人认为题目应该是这样的:
已知(4x-y-1)²+√(xy-2)=0
求2x²y-4x²y²-xy²
(4x-2y-1)²+√(xy-2)=0
(4x-2y-1)²≥0
√(xy-2)≥0
而:(4x-2y-1)²+√(xy-2)=0
∴(4x-2y-1)²=0
√(xy-2)=0
即:4x-2y=1
2x-y=½
xy=2
2x²y-4x²y²-xy²
=xy(2x-y)-4(xy)²
=2×½-4×4
=1-16
=-15
本人认为题目应该是这样的:
已知(4x-y-1)²+√(xy-2)=0
求2x²y-4x²y²-xy²
(4x-2y-1)²+√(xy-2)=0
(4x-2y-1)²≥0
√(xy-2)≥0
而:(4x-2y-1)²+√(xy-2)=0
∴(4x-2y-1)...
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本人认为题目应该是这样的:
已知(4x-y-1)²+√(xy-2)=0
求2x²y-4x²y²-xy²
(4x-2y-1)²+√(xy-2)=0
(4x-2y-1)²≥0
√(xy-2)≥0
而:(4x-2y-1)²+√(xy-2)=0
∴(4x-2y-1)²=0
√(xy-2)=0
即:4x-2y=1
2x-y=½
xy=2
2x²y-4x²y²-xy²
=xy(2x-y)-4(xy)²
=2×½-4×4
=1-16
=-15
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