(本题满分10分,每小题5分)请你把上面的解答再认真地检查一遍,

(本题满分10分,每小题5分)

请你把上面的解答再认真地检查一遍,别留下什么遗憾,并估算一下成绩是否达到了80分,如果你的全卷得分低于80分,则本题的得分将计入全卷总分,但计入后全卷总分最多不超过80分;如果你全卷得分已经达到或超过80分,则本题的得分不计入全卷总分.

(1)计算 -2 +3的结果是_  _;

(2)如图,点C在⊙O上,∠ACB=50°,则∠AOB=_  _°

 

答案

 

(1)1

(2)100°

解析:解:(1)1; 5分

(2)100°.    10分

 

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