9÷= ×7.2= += ÷6= 15÷=
×= ÷= 42×= 10-0.99= ×12=
①
②
③
④
⑤
⑥
×2= ×1= ×0= 1.6×=
×16= 12÷ = × =
0× + = 1÷ = ÷ =
÷ = × ÷ × =
÷ = × = - =
+ = 15× = ÷ =
3.14×9= 7.2×= 1.25××0.8=
3.14×2.25= 12×()=
城市
巴黎
悉尼
伦敦
东京
与北京时间相差/时
-7
+2
-8
+1
春
夏
秋
冬