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2. Forty divided by eight ______ (is, are) five.

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1. His friend and fellow author ______ (was, were) cool to the idea of collaborating on a cookbook.

His friend and fellow author ________ (was, were) cool to the idea

A. cookbook.

7/11×11/7= 6的倒数为。

4/5×5/4=1，所以二者互为倒数