The Abacus 在線電子書 圖書標籤:
發表於2024-11-12
The Abacus 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024
The abacus is as useful and effecient a machine today as it was when it was first created centures ago. Whether you're an expert in the latest computer technology or you're mastering arithmetic and word problems for the first time, it won't take long to learn the basics (and even the not-so-basics) of adding, subtracting, multiplying, and dividing on this ingenious and fun-to-use mathematical tool.
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The Abacus 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024