已知Ia+5I和Ib-2I互为相反数,求a+b的值.
问题描述:
已知Ia+5I和Ib-2I互为相反数,求a+b的值.
答
Ia+5I和Ib-2I互为相反数 ==> |a +5| +|b -2|= 0 ==> a+5 = 0,b -2 = 0 ==> a = -5,b =2 a +b = (-5) +2 = -3
已知Ia+5I和Ib-2I互为相反数,求a+b的值.
Ia+5I和Ib-2I互为相反数 ==> |a +5| +|b -2|= 0 ==> a+5 = 0,b -2 = 0 ==> a = -5,b =2 a +b = (-5) +2 = -3