求0.3m²n-1/5mn²+0.4n²m-m²n-1/2m²n的值,
设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
已知m+n+=3,mn=三分之二,求m²+(n-m)²+2m(n-mn)的值
若(2m-n)²=3mn,求代数式n/m+4m/n-1的值
m²n(m-n)-4mn(n-m)
已知m,n满足4m²+n²=5,mn=-1,求4m²-4mn+n²/2m+n除以
先化简(m/m-n-n/m+n+2mn/m²-n²)²÷m²+mn/m,若m=1
m-n分之m - m+n分之n + m²-n²分之2mn
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²
1+n-m/m+2n÷m²-n²/m²+4mn+4n²=
化简(m²/m-n - m+n)÷2m²-mn/n - m
设m=1/5n 设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
已知m+n=2,mn=1,求m³n+mn³+2m²n²的值