已知3m-n=5,mn=-2,求9m^2+n^2的值已知m^2+2m+1=0,求m^3+2m^2+3m的值

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已知3m-n=5,mn=-2,求9m^2+n^2的值已知m^2+2m+1=0,求m^3+2m^2+3m的值已知3m-n=5,mn=-2,求9m^2+n^2的值已知m^2+2m+1=0,求m^3+2m^

已知3m-n=5,mn=-2,求9m^2+n^2的值已知m^2+2m+1=0,求m^3+2m^2+3m的值
已知3m-n=5,mn=-2,求9m^2+n^2的值
已知m^2+2m+1=0,求m^3+2m^2+3m的值

已知3m-n=5,mn=-2,求9m^2+n^2的值已知m^2+2m+1=0,求m^3+2m^2+3m的值
1. 9m^2+n^2=(3m-n)^2+6mn=13
2. 由m^2+2m+1=0得(m+1)^2=0即没=-1
m^3+2m^2+3m=-2