(70+1/68)*1/69怎么简算

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(70+1/68)*1/69
=(69+1+1/68)*1/69
=1+69/68*1/69
=1+1/68
=69/68

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(70+1/68)*1/69
=(69+69/68)*1/69
=69*1/69+69/68*1/69
=1+1/68
=69/68

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