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  1. If \(a\)\(b\)\(c\), and \(d\) are four different digits from \(1\) to \(9 \), inclusive, then what's the largest possible value for the decimal \(a.b+c.d\)?
  2. If \(a\)\(b\)\(c\), and \(d\) are replaced by four distinct digits from \(1\) to \(9 \), inclusive, then what's the largest possible value of the difference \(a.b-c.d\)?
  3. If \(a\)\(b\)\(c\), and \(d\) are replaced by four different digits from \(1\) to \(9 \), inclusive, then what's the largest possible value for \(a.bc+0.d\) ?
 Oct 31, 2018
 #1
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First one

 

a = 9   b  = 8   c  = 7   d   =  6

 

9 . 8  +  7 . 6  =   17.4

 

Second one

 

a = 9  b  =  8    c  =  1   d  = 2

 

9.8  -  1.2   =  8. 6

 

Third one

 

a  = 9     b  = 8    c  =  7     d  = 6

 

9.87 + 0.6    =  9.93

 

 

cool cool cool

 Oct 31, 2018

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