已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.

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已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.已知-m+2n=5,那么(m-2

已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.
已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.

已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.
已知-m+2n=5,那么(m-2n)²+6n-3m-60=__-20_____.

-m+2n=5
2n-m=5
m-2n=-5
6n-3m=3(2n-m)
(m-2n)²+6n-3m-60=25+15-60=-20

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