㎡+3m+1=0 求㎡+㎡分之一的值
问题描述:
㎡+3m+1=0 求㎡+㎡分之一的值
答
㎡+3m+1=0两边同除以m
m+3+1/m=0
m+1/m= -3
㎡+1/㎡
=(m+1/m)^2-2
=(-3)^2-2
=9-2
=7