括号70+1/68括号乘1/69

日期：2021-08-23 00:07:41 人气：1

括号70+1/68括号乘1/69

括号70+1/68括号乘1/69
=（69+69/68）x1/69
=69x1/69+69/68x1/69
=1+1/68
=1又1/68
    A+
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