若m^2-2m=1,则2m^2-4m=2007的值是?
问题描述:
若m^2-2m=1,则2m^2-4m=2007的值是?
答
等于2009.2m^2-4m+2007= 2(m^2 - 2m) + 2007,而(m^2 - 2m) =1 2(m^2 - 2m) + 2007= 2X 1 +2007 = 2009
若m^2-2m=1,则2m^2-4m=2007的值是?
等于2009.2m^2-4m+2007= 2(m^2 - 2m) + 2007,而(m^2 - 2m) =1 2(m^2 - 2m) + 2007= 2X 1 +2007 = 2009