(—2mn)(3m²—2mn—4n²)
{(m+n)²-4mn}{(m-n)²+4mn}+2(mn)²等于多少?
m+n=3,mn=-2时,2(-mn+3n+4m)—(14n+18m—mn)÷2的值
(7m²-4mn-n²)-(3m²-mn+2n²)求解
规定新运算:m#n=m+n,m﹡n=m-n,试化简[(mn²﹚#(2mn)]+[(4mn²)﹡(3m
4-m²n²+2mn
已知m+n=3,mn=—2,求代数式(3m+5mn)—(3mn—3n)的值!
(3m-2n)²+24mn
3(m^2n+mn)-4(mn-2m^2n)+mn.
若m+n=3,则2m²+4mn+2n²-6的值为——
已知m+n=2 mn=-4,则2(mn-3m)-3(2n-mn)
(4mn²+3m²n-4m)-2(mn²+3/2m²n+1)化简
m=-2,n=3 4(3m²n-mn²)-5(-mn²+3m²n)