6+3-1=____
7-2+1=____
3+7-4=____
3+2+5=____
4+3-5=____
9-5+4=____
袋子中装有2个红球和5个白球,这些球除颜色外均相同.在看不到球的条件下,随机从袋中摸出一个球,则摸出白球的概率是( )
- What will the weather be like tomorrow?
- It _____ be rainy, cloudy or sunny. Who knows?
简答题