2.33x2\5+2.77\2.5

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2.33x2\5+2.77\2.52.33x2\5+2.77\2.52.33x2\5+2.77\2.52.33x4/10+2.77x4/10=(2.33+2.77)x4/10=5.1x4/10=20.

2.33x2\5+2.77\2.5
2.33x2\5+2.77\2.5

2.33x2\5+2.77\2.5
2.33x4/10+2.77x4/10=(2.33+2.77)x4/10=5.1x4/10=20.4/10=2.04
这个题目其实是很简单的,关键在于是否发现2.5,也就是5/2和2/5的倒数关系,乘以2/5就是除以2.5