一个盒子里装有红、黄、蓝、绿、黑、白六种颜色的跳棋各10枚，从中最少摸出几枚才能保证有2枚颜色相同？从中至少摸出几枚，才能保证有4枚颜色相同？
直接写得数．×1=×=×12=×=30×=9×= ×= ×50= 6×= ×=
算一算．2×3 4×2 1×2×3× 11×3× 2××1．
直接写出得数．×8= = 4.5+= 26×= 7﹣=×0×14= 6×= 5﹣= ×6= 45×=
直接写出得数．×= ×= ×5= ×=×= 42×π= 22×π= 32π=
口算．= = = == = = =
×1=
×
=
×12=
×
=
=
= 
×
= 
×50= 6×
= 
×
=
×3
4
×2
1
×2
×3
×
11×3
×
2
×
．
×8= 
= 4.5+
= 26×
= 7﹣
=
×0×14= 6×
= 5﹣
= 
×6= 45×
=
×
×
= 
×5= 
×
=
×
= 42×π= 22×π= 32π=
= 
= 
= 
=
= 
= 
= 
=
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