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If a and b are positive integers and their product is 3 times their sum, what is the value of 1/a + 1/b?


Given that ab = 3(a + b).
From this, ab/3 = a + b.
Dividing through by ab yields 1/a + 1/b = 1/3.

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  1. ดีผมไม่แน่ใจ

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    posted by abella
  2. Abella ถ้าคุณไม่รู้จักไม่ตอบ

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  3. ฮ่า ๆ

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  4. ตูด

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    posted by abella

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