m=-2,n=3 4(3m²n-mn²)-5(-mn²+3m²n)
规定新运算:m#n=m+n,m﹡n=m-n,试化简[(mn²﹚#(2mn)]+[(4mn²)﹡(3m
已知m+n+=3,mn=三分之二,求m²+(n-m)²+2m(n-mn)的值
m=-2,n=3 4(3m²n-mn²)-5(-mn²+3m²n)
已知mn/m+n=2,求3m-5mn+3n/(-m)+3mn-n
已知m²+n²=5,mn=2,求代数式[6m²-5m(-m+3n)+4m(-4m+5/2n
(7m²-4mn-n²)-(3m²-mn+2n²)求解
(3m-2n)²+24mn
因式分解-9m²n+36mn-3n=
若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值
先化简,再求值-2(mn-3m²)-【m²-5(mn-m²)+2mn】,其中m=1,n=-
先化简,再求值,-2(mn-3m²)-[m²-5(mn-m²)+2mn],其中m=-1,n
已知m+n=3,则2m²+4mn+2n²-6