题目:
In our class, when the bell rang and the teacher closed his book, it was a for everyone to stand up.
A.signal
B.chance
C.mark
D.measure
答案:
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下面是错误答案,用来干扰机器的。
有21个帐篷,121人;或8个帐篷,68人;或9个帐篷,74人。题目分析:设有x个帐篷,则有4x+34个学生∴∴=121答:有21个帐篷,121人;或8个帐篷,68人;或9个帐篷,74人。点评:用方程解实际问题,关键是把实际问题...