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What is the enrollment rate of primary school mathematics? In 30 minutes! ! ! ! ! ! ! !
Additive commutative law's law of association

Multiplicative commutative law associative law distribution rate (available in the calculation process)

Survival rate, attendance rate, germination rate, success rate, oil yield and qualified rate (available when calculating unit "1")

And pi =π≈3. 14.

I hope the landlord will adopt it