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Algebra Problem [Copy link] 中文

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Post time 2017-4-4 12:28:07 |Display all floors
If xy=28 and x + y = 7, what is the simplified sum of the reciprocals of x and y?

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Post time 2017-4-8 06:23:23 |Display all floors
Children's maths

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Post time 2017-4-8 09:14:42 |Display all floors
dusty1 Post time: 2017-4-8 06:23
Children's maths

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Post time 2017-4-8 10:26:07 |Display all floors
茉莉儿 Post time: 2017-4-8 09:14

I taught my daughter maths, science and how to reasearch before she went off to university

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Post time 2017-4-14 00:19:05 |Display all floors
X + Y = 7, X & Y all < 7,  at her, 3 + 4 = 7,  3 * 4  may get the maximum value of product , 3 * 4 and less than 28,    the proposition no solution?  

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Post time 2017-4-14 00:28:06 |Display all floors
dusty1 Post time: 2017-4-8 10:26
I taught my daughter maths, science and how to reasearch before she went off to university

Ride the moto she is your daughter ?
Please you careful understand this topic.

Either the proposition is wrong, or is a very complex mathematical problems.  

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Post time 2017-4-14 00:30:31 |Display all floors
Tsaokuohua = 曹国华 = 320602520830201

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