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multiplication
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multiplication
九九
中国古代数学中的乘法口诀或表格,因早先的形式始于“九九八十一”,与现在次序相反,故名。又称九九表、九九之术。
Physics
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霍普夫代数
Hopf algebra
multiplication
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multiplication
①放大,倍增 ②乘法
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multiplication
乘法
multiplication
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Astronomy
multiplication
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