作业帮 > 数学 > 作业

(1/2m²-n)(1/2m²+n)-(2m²-n)²+(-3/2)²

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/07 18:40:25
(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)²-{(2/3m-1/2n)²-6[(1/2m-n)²-(1/2m+n)²]}-4/3m*(8/3m-7n)
=4m²-4mn+n²-4/9m²+2/3mn-1/4n²-12mn-32/9m²+28/3mn
=3/4n²-6mn