×72%=
÷=
1+3%=
+1÷7=
×÷×=
10÷10%=
×=
-=
0×+=
1÷-÷1=
÷10= ÷= += ÷=
×2.4= ÷= ×= -=
×÷×= 24×(++)=
故障轮船 商船
军舰 货船