m的平方减2m减1等于零,则3m立方减(2m+1)平方减3(m一1)
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解决时间 2021-03-27 05:54
- 提问者网友：雨不眠的下
- 2021-03-27 00:05
m的平方减2m减1等于零,则3m立方减(2m+1)平方减3(m一1)
最佳答案
- 五星知识达人网友：往事埋风中
- 2021-03-27 00:19
m^2-2m-1=0 则m^2-2m=1
3m^3-(2m+1)^2-3（m-1)
=3m^3-(4m^2+4m+1)-3（m-1)
=3m^3-4m^2-4m-1-3m+3
=3m^3-4m^2-4m-3m-1+3
=3m^3-4m^2-7m+2
=3m^3-6m^2+2m^2-7m+2
=3m(m^2-2m)+2m^2-7m+2
=3m+2m^2-7m+2
=2m^2-4m+2
=2(m^2-2m)+2
=2+2
=4
3m^3-(2m+1)^2-3（m-1)
=3m^3-(4m^2+4m+1)-3（m-1)
=3m^3-4m^2-4m-1-3m+3
=3m^3-4m^2-4m-3m-1+3
=3m^3-4m^2-7m+2
=3m^3-6m^2+2m^2-7m+2
=3m(m^2-2m)+2m^2-7m+2
=3m+2m^2-7m+2
=2m^2-4m+2
=2(m^2-2m)+2
=2+2
=4
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