9km15m9150m 284g 0.284kg
7.9×100= 0.5+0.75= 1-0.07= 0.64+0.46=
5.59-0.5= 4.3+5.7= 7-2.8= 2800÷25÷4=
6×25×4= 74÷100= 0÷78= 143-27-73=
①67+25+33+75
②237×50×2
③47.12-9.76-3.24
④480÷[(24+72)÷6]
⑤7500÷4÷25
⑥99×64+64
怎样租船最省钱?