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A diet report requires that the daily diet contains 65,438+000 units of fat, 200 units of protein and 400 units of starch. There are three kinds of food, ABC and each serving.
The process is as follows:

2A+2B+ 10C= 100, which gives A=50-B-5C.

7A+4B+ 16C=200. If A=50-B-5C is brought into 7A+4B+ 16C=200, we get B=50- 19/3C.

17A+7B+30C=400 Bring B=50- 19/3C into 17A+7B+30C=400 to get C=6.

Substituting C=6 for B=50- 19/3C, we get B= 12.

Bring B= 12 and C=6 into A=50-B-5C, and get that A=8A needs 8 copies, b needs 12 copies and c needs 6 copies.

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