вϵ漰֪ʶ൱㷺һࡣܵһϵнϼұȽյĿ㣬ʱҿܻһĿ˽ȥһ̡һĿܾͻ֣ǣ⣬ֻҪ3죬йרҽһ裬⡣
1һҪ20ɣҵҪ10ɡ1죬Ȼҽ1죬ɼ1…˽湤ôö?
A.16 B.15 C.14 D.13
𰸡C
й蹤W=20P=1P=21ѭڵʱΪ2죬һѭڵЧʺΪ1+2=320÷3=6…26ѭڣ6×2=12ʣΪ2.131ʣ2-1=1Ҽɡʹ12+1+0.5=13.5졣ˣѡC
Ŀֻ֪ߣ
1 ȷһڵʱЧ
2 ڵĸԼʣ
3 ĿҪʣ
2ӡһҪ12СʱɣҵҪ15Сʱڣס1Сʱҹ2Сʱ;2Сʱҹ1Сʱ;1Сʱҹ2Сʱ……˽ȥӡⲿҪСʱ?
3һˮذװ˼סҡˮܡܣҪ12Ӱһˮſ;ҹܣҪ15Ӱһˮſ;ܣҪ20ܽһˮſաڣסҡţÿθ2ӣһˮſҪʱ?
A.14 B.14.5 C.15 D.15.5
𰸡B
й蹤W=60P=5P=4P=3һѭڵʱΪ2×3=6ӣһѭڵЧʺΪ(5+4+3)×2=2460÷24=2…122ѭڣʣΪ12ܹ2ӣ5×2=10ʣ2Ҫҹܷ2÷4=1/2СʱˣһˮſҪ12+2+0.5=14.5СʱˣѡB
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