58760000=亿≈亿(精确到十分位)
3吨50千克=吨 18分=小时
2.4÷0.22.4 1.56 ×0.281.56 8.6×0.258.6÷4
6.8-0.08= 4.9÷0.01= 4.6-4.6÷4.6=
4.5+0.55= 0.37×20= 0.18×2.5 ÷0.18×2.5=