际距离是千米。
24×=
2.28-0.18=
1÷0.25=
3.75+=
4.8÷3=
-=
×6.9=
0.1÷0.1%×0.8=
1.2x-5.5=0.5 :x=3:16 9x+42=150
[1-(+)]÷ 2÷× (8.9-7.7)÷0.2×0.15
24×(+-) ÷+× 8.63-3.2+7.37-6.8