问题
填空题
盒子中装有8个红球和8个白球,任意摸出1个球,是红球的可能性是______,至少摸出______个球,才能保证至少有2个球的颜色相同.
答案
(1)8÷(8+8)=
,1 2
(2)要保证少有两个球的颜色相同.至少应摸出2+1=3个.
答:是红球的可能性是
,至少摸出3个球,才能保证至少有2个球的颜色相同;1 2
故答案为:
,3.1 2
盒子中装有8个红球和8个白球,任意摸出1个球,是红球的可能性是______,至少摸出______个球,才能保证至少有2个球的颜色相同.
(1)8÷(8+8)=
,1 2
(2)要保证少有两个球的颜色相同.至少应摸出2+1=3个.
答:是红球的可能性是
,至少摸出3个球,才能保证至少有2个球的颜色相同;1 2
故答案为:
,3.1 2
阅读理解。 | ||||
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1. Who is the author of the book My Friend, Mandela? | ||||
A. Sally Prue. B. Denis Herbstein. C. Tony Bradman. D. Martin Waddell. | ||||
2. The price of the used book is at least _______. | ||||
A. $ 23.56 B. $ 19.78 C. $ 6.78 D. $ 15.27 | ||||
3. Which collectible book is the most expensive one? | ||||
A. Princess Pip's Holiday. B. The Ghost Ship. C. The King of Football. D. My Friend, Mandela. | ||||
4. How many books of The King of Football are there on sale? | ||||
A. 25. B. 89. C. 35. D. 76. | ||||
5. If you want to buy a used The Ghost Ship , you will save _______. | ||||
A. $ 15.27 B. $ 6.78 C. $ 20.85 D. $ 23.56 |