(5/3m²-2mn+n²)·(3m²n)
m=-2,n=3 4(3m²n-mn²)-5(-mn²+3m²n)
已知mn/m+n=2,求3m-5mn+3n/(-m)+3mn-n
(3m-2n)²+24mn
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=-
mn(m-n)²-n(n-m)³=n(m-n)²( )
已知m+n+=3,mn=三分之二,求m²+(n-m)²+2m(n-mn)的值
规定新运算:m#n=m+n,m﹡n=m-n,试化简[(mn²﹚#(2mn)]+[(4mn²)﹡(3m
2.已知m²-mn+2,mn-n²=5则3m²+2mn-5n²=( )
设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)÷(2m-3n)化简,
(m²-6mn+9n²)÷(m-3n)-(4m²-9n²)-(2m-3n)怎么做