m+n=5,mn=14,则(3m-2n)-(-5n+mn)
1个回答
(3m-2n)-(-5n+mn)
=3m-2n+5n-mn
=3m+3n-mn
=3(m+n)-mn
=3*5-14
=1
相关问题
m²-mn=5,mn-n²=2,则3m²+2mn-5n²等于多少
若m-n=-3 mn=2 则(-5m+2)-5(2mn-n)=
已知m+n=5,mn=3,则m2n+mn2=______.
已知m2-mn=2,mn-n2=5,则3m2+2mn-5n2=______
已知m2-mn=2,mn-n2=5,则3m2+2mn-5n2=______
已知mn/m+n=2求3m-5mn+3n/-m+3mn-n
已知mn/m+n=2,求3m-5mn+3n/(-m)+3mn-n
m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn)
(3m-5n+4mn)-(2m-4n+6mn)其中m-n=7,mn=-5
7m²n-3mn²+5m²n+2mn²