86.4÷36=
1.57÷3.9≈保留两位小数)
☆7.59÷0.23=
8.37×0.2+8.37×2.8 37.2+3+6.2 4.5×3.7×2
12.5×3.7×0.8 9.6×10.1 10÷3.14-6.86÷3.14