(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²(m²n+n²)-25/4m²n

问题描述:

(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²(m²n+n²)-25/4m²n
-15m⁴+1/4n²
(2m-n)²-{(2/3m-1/2n)²-6[(1/2m-n)²-(1/2m+n)²]}-4/3m-(8/3m-7n)
3/4n²-6mn

(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²(m²n+n²)-25/4m²n =1/4m⁴-n² -4m⁴+4m²n-n² -4m²n+9/4n² =-15/4m⁴+1/4n²(2m-n)&...