已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.
问题描述:
已知-m+2n=5,那么(m-2n)²+6n-3m-60=_______.
答
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
数学辅导团为您解答,不理解请追问,理解请及时采纳!(*^__^*)