甲数是X,乙数比甲数的5.5倍少y,乙数是多少?两数的和是多少？甲=x乙=5.5x+y甲+乙=x+5.5x+y=6.5x+y
乙数是 5.5x-y两数和是 x+5.5x-y=6.5x-y
乙数是5.5X-y两数和=5.5X-y+X = 6.5X-y
