9.9×6.970 10.7210.72÷3.2
6.34÷0.16.34×0.1 3.36÷0.1233.6÷1.2
8.39+2.71= 7.8-6.07=
0.26×0.35= 2.415÷1.2≈ (得数保留两位小数)