0.72+0.8=
4.9+3.1=
0.63-0.3=
9-5.9=
4.2×0.3=
0.13×0.2=
0.04×1.5=
0.03×2.1=
0÷0.08=
5.8÷0.1=
6.5÷0.65=
0.9÷0.001=