四、想一想,填一填。(每空2分,共26分)

( : ) ( : ) ( : ) ( : )

( : ) ( : ) ( : ) ( : )
( : ) ( : ) ( : ) ( : )
( : ) ( : ) ( : ) ( : )
答案
$\boldsymbol{8:50}$;$\boldsymbol{9:30}$;$\boldsymbol{25}$;$\boldsymbol{9:20}$;$\boldsymbol{30}$;$\boldsymbol{10:50}$;
$\boldsymbol{1:35}$;$\boldsymbol{20}$;$\boldsymbol{1:55}$;$\boldsymbol{35}$;$\boldsymbol{2:30}$;$\boldsymbol{45}$;$\boldsymbol{3:15}$。
$\boldsymbol{1:35}$;$\boldsymbol{20}$;$\boldsymbol{1:55}$;$\boldsymbol{35}$;$\boldsymbol{2:30}$;$\boldsymbol{45}$;$\boldsymbol{3:15}$。
五、开火车。(每空1分,共25分)

答案
55, 28, 14, 2, 66,
84, 42, 26, 13, 39,
66, 11, 88, 30, 10,
64, 8, 80, 20, 60,
70, 36, 12, 24, 48
84, 42, 26, 13, 39,
66, 11, 88, 30, 10,
64, 8, 80, 20, 60,
70, 36, 12, 24, 48
解析
55, 28, 14, 2, 66, 84, 42, 26, 13, 39, 66, 11, 88, 30, 10, 64, 8, 80, 20, 60, 70, 36, 12, 24, 48
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