已知-m+2n=2, 求(m-2n)²+6n-3m-3的值?
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已知-m+2n=2, 求(m-2n)²+6n-3m-3的值?
已知-m+2n=2, 求5(m-2n)²+6n-3m-3的值?
已知-m+2n=2, 求5(m-2n)²+6n-3m-3的值?
![已知-m+2n=2, 求(m-2n)²+6n-3m-3的值?](/uploads/image/z/1142655-15-5.jpg?t=%E5%B7%B2%E7%9F%A5-m%2B2n%3D2%2C+%E6%B1%82%28m-2n%29%26%23178%3B%2B6n-3m-3%E7%9A%84%E5%80%BC%3F)
5(m-2n)²+6n-3m-3
=5*(-2)²+3*2-3
=20+6-3
=23
=5*(-2)²+3*2-3
=20+6-3
=23
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