0.27km2=m2 5600000 m2=公顷
4.8÷0.64.8÷0.9 2.4÷0.42.4×2.4
1÷0.4= 0.32÷8= 2.7+0.43= 0.25×4= 6.9×0.2÷6.9=
①(3.8+1.6)÷0.8
②9.6÷0.125÷0.8
③9.18÷(9.3-6.75)
④8.4÷4.2+8.4÷0.42
⑤4.7×0.59+0.59×5.3
A.边长为60厘米;B.边长为80厘米。