数学问题
M的平方+M-1=0,求M三次方+2(M平方)+1997=? 很急谢谢!!!!
参考答案:因为M^2+M-1=0
所以M^2+M=1
则M^3+M^2=M
M^3+2M^2+1997
=M^3+M^2+M^2+1997
=M+M^2+1997
=1+1997
=1998
M的平方+M-1=0,求M三次方+2(M平方)+1997=? 很急谢谢!!!!
参考答案:因为M^2+M-1=0
所以M^2+M=1
则M^3+M^2=M
M^3+2M^2+1997
=M^3+M^2+M^2+1997
=M+M^2+1997
=1+1997
=1998