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mathematical problem
On the Pythagorean number of 48

1,(48),7

4,(48) 8

1 1 (48) 13

. . .

get

It is also known that A (bought 13 pieces) bought 9 more goods than B (bought 4 pieces).

B (bought 8 pieces) bought 7 pieces more than A (bought 1 piece).

get

A (bought 13), and his wife (that is, C) bought 1 1.

13* 13 - 1 1* 1 1=48

B (bought 8 pieces), and my wife (that is, B) bought 4 pieces.

8*8 - 4*4=48

C (bought 7 yuan), and my wife (a) bought/kloc-0 yuan.

7*7 - 1* 1=48