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理解乘法和除法是互为逆运算；
Understand multiplication and division are inverse.
youdao
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如果时间允许，我们也会学一些乘法的运算。
If time allows, the class will also cover multiplication on the abacus.
youdao
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如果时间允许，我们也会学一些乘法的运算。
If time allows, the class will also cover multiplication on the abacus.
youdao