作业帮[(m+n)²-(m+2n)(3m-n)-5m²]除以2m,其中m=-2 n=1/2
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/02 13:10:16
![[(m+n)²-(m+2n)(3m-n)-5m²]除以2m,其中m=-2 n=1/2](/uploads/image/z/1124308-28-8.jpg?t=%5B%28m%2Bn%29%26%23178%3B-%28m%2B2n%29%283m-n%29-5m%26%23178%3B%5D%E9%99%A4%E4%BB%A52m%2C%E5%85%B6%E4%B8%ADm%3D-2+n%3D1%2F2)
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[(m+n)²-(m+2n)(3m-n)-5m²]除以2m,其中m=-2 n=1/2
[(m+n)²-(m+2n)(3m-n)-5m²]除以2m,其中m=-2 n=1/2
[(m+n)²-(m+2n)(3m-n)-5m²]除以2m,其中m=-2 n=1/2
原式=[m^2+2mn+n^2-3mn+mn-3mn+n^2-5m^2]/2m
=[-7m^2+2n^2]/2m
=[-7*4+2*1/4]/2*(-2)
=[-55/2]/-4
=55/8
答案是77/16