(7m²-4mn-n²)-(2m²mn-n-2n²);要过程谢谢
(7m²-4mn-n²)-(3m²-mn+2n²)求解
4-m²n²+2mn
m²n(m-n)-4mn(n-m)
规定新运算:m#n=m+n,m﹡n=m-n,试化简[(mn²﹚#(2mn)]+[(4mn²)﹡(3m
m-n分之m - m+n分之n + m²-n²分之2mn
(3m-2n)²+24mn
化简(m²/m-n - m+n)÷2m²-mn/n - m
{(m+n)²-4mn}{(m-n)²+4mn}+2(mn)²等于多少?
分式2n/m²-mn,m/n²-mn,n/m²-n²的最简公分母
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²
1+n-m/m+2n÷m²-n²/m²+4mn+4n²=
给出公式(m+n)²=m²+2mn+n²:(m-n)²=m²-2mn+