单词：commutativity of multiplication
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The World was an orange when I went to school, 我上学的时候，世界对我来说就像一个橙子， and there were only three things I can remember that I ever learned for sure that the Dutch children wore wooden shoes, 我记得只有三个细
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by Jason Marshall In past articles weve talked at length about three of the big four traditional processes used in basic arithmetic: addition (see also How to Add Quickly), subtraction, and division. However, for one reason or another, we havent yet
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Radio Essays Explore Technological Creativity There are mechanisms in nature as well as in human endeavors like engineering and art. Since 1988, the creative manipulation of these mechanisms has been explored in short radio essays about the history o
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When I was a kid I was top of the class in maths. I was really good at mental arithmetic and doing sums. Things were easy back then, It was all addition and subtraction, multiplication and division. I knew my times tables like the back of my hand. Th
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But when they really get pushy, people really get pushy, I say, I do it because you do it for your kid. 但是当他们变得有进取心时，我们就会变得更有进取心，我说：我这样做就像你们为自己的儿子做的原因一样。
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