小明今年a岁,比小刚小3岁,小刚今年(a-3)岁.
2.5×0.4= 5.7-4.3= b-0.01b= 0.22=
0.26÷0.5= 0.42÷0.06= 5a×4a= 1.3×0.26+0.74×1.3=