143547......first two digit come by multiplying first of that asked in question with that of second one.

Next two come by multiplying question first digit with third  and 
 last two digit comes by first digit multiply of sum of next two digit then subtract the middle one....

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143543 by the following method 
first 2 numbers came by mulitiplying the first to numbers of 7+2+5
i.e., 7×2=14 
and second 2 numbers are came by multiplying the first and last numbers of 7+2+5
i.e., 7×5=35
and the next 2 numbers by adding the first 2 numbers and then multiply with third number and then the value came will be subtract with the middle number of 7+2+5
i.e., 7+2=9      

similarly we get the answers for above situations