2.2×0.5= 1.6×0.03= 0.3×50= 5.09×0.2=
0.8×0.13= 0.34÷17= 8.08÷0.4= 0.5×2.2=
1÷0.25= += ×24= +=
﹣= 470×0.02= 10÷= 6×0=
1﹣35%= 6.5×20%= 1.5÷= =