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If 2 men start from the same place, and travel in opposite directions; one at the rate of 3f miles in an hour, and the other 4 j miles; how far will they be apart at the end of 1 hour ? how far at the end...
First lessons in arithmetic: on the plan of Pestalozzi, with some improvements - Σελίδα 131
των Warren Colburn - 1825 - 172 σελίδες
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## The New Normal Written Arithmetic: Designed for Common Schools, Normal ...

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## Ray's New Intellectual Arithmetic

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## First Lessons in Arithmetic on the Inductive Plan: Including Oral and ...

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