Question

若x绝对值等于4,y绝对值等于5,且绝对值x减y等于y减x,求x与y的值

Answer 1

由题意：IxI = 4 I yI = 5 Ix-yI =y-x

Ix-yI大于等于0,由于x与y不相等,因此 y-x>0,

那么,y等于5时,x= 正负4

y = - 5 时,x取何值都会使y-x