(1/5m-1/2n)(1/25m+1/10mn+1/4n)怎么化简?
(1/5m-1/2n)(1/25m+1/10mn+1/4n)怎么化简?
设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
4(-2mn+2m+3n)-2(3m+5n-mn),其中m+n=3,mn=-1
若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值
化简求值(m+n)(m^2-mn+n^2)+(m-n)(m^2+mn+n^2)m=-1 n=199
-2(mn-3m^2)-[m^2-5(mn-m^2)+2mn】,其中m=1,n=﹣2 化简求值
3(m^2-mn+2n^2)-2(mn-m^2+n^2)+(5mn-4n^2+1)
若m-n=4,mn=-1,求代数式(9-2mn+2m+3n)-(m+4n+mn)的值
设m=1/5n 设m等于1/5n求 2n/(m+2n)+m/(2n-m)+4mn/(4n²-m²)
已知m+n=10,mn=24,求值:(1)m^2+n^2;(2)(m-n)^2
若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值