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Middle school mathematics 20 17 answer
Solution (1)

Because it takes three days for the master to finish it alone and six days for the apprentice to finish it alone,

That is, the master does 1/3 every day and the apprentice does 1/6 every day.

Therefore, the cooperation between two people must be completed within1(1/3+1/6) =1(1/2) = 2 (days).

(2)

Judging from the first question, the master does 1/3 every day, and the apprentice does 1/6 every day. The apprentice does it for three days first, and then two people cooperate, so it is necessary.

(1-1/6 * 3)/(1/3+1/6) = (1/2) =/kloc-0.

So the two need to cooperate 1 day.

I hope it helps you.

I wish you progress in your study! ! ! ! !