Question

(1)若两数之差是29,大数除以小数商是3,余数是5,则大数是( ),小数是( ).

Answer 1

(1)设大数X小数Y.列方程X-Y=29,X=3Y+5,解得X=41,Y=12

(2)设白羊X头,黑羊Y头.方程:X+20=4Y,Y+145=4X,解得X=40,Y=15

(3)设甲X岁,乙Y岁,则甲比乙大(X-Y)岁,方程:Y-(X-Y)=2,X+(X-Y)=38,解得X=26,Y=14