已知x²y的值是2,则(5x²y+5xy-7x)-(4x²y+5xy-7x)的值为 A.二分之一 B.-2 C.2 D.4
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![已知x²y的值是2,则(5x²y+5xy-7x)-(4x²y+5xy-7x)的值为 A.二分之一 B.-2 C.2 D.4](/uploads/image/z/3695445-45-5.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3By%E7%9A%84%E5%80%BC%E6%98%AF2%2C%E5%88%99%285x%26%23178%3By%2B5xy-7x%29-%284x%26%23178%3By%2B5xy-7x%29%E7%9A%84%E5%80%BC%E4%B8%BA+A.%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80+B.-2+C.2+D.4)
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已知x²y的值是2,则(5x²y+5xy-7x)-(4x²y+5xy-7x)的值为 A.二分之一 B.-2 C.2 D.4
已知x²y的值是2,则(5x²y+5xy-7x)-(4x²y+5xy-7x)的值为 A.二分之一 B.-2 C.2 D.4
已知x²y的值是2,则(5x²y+5xy-7x)-(4x²y+5xy-7x)的值为 A.二分之一 B.-2 C.2 D.4
(5x²y+5xy-7x)-(4x²y+5xy-7x)
=5x²y+5xy-7x-4x²y-5xy+7x
=x²y
=2
选C