十题,十题,
十题,设甲年龄X岁,乙现在年龄Y岁Y×1/2=Y-(X-Y)X+(X+X-Y)=63X=27 Y=18
设甲年龄X岁,乙现在年龄Y岁Y×1/2=Y-(X-Y)X+(X+X-Y)=63X=27 Y=18