7.3×1.27.3 4.9×0.654.9
0.45÷0.990.45 2.85÷0.62.85×0.6
5.36×4.7=×0.47 1.74×2.3=×23
3.8+0.62= 0.15×0.8= 0.1:0.01= 0.5吨:50千克=
10×10%= ÷12= 1.6+0.4×10= =