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20 12 Tianjin college entrance examination mathematics sixth question
A:

Is this it? 20 12 general college entrance examination mathematics Tianjin (science)

The answer to the sixth question:

(6) At ABC? The sides of the middle angle and the inner angle A, B and C are cba, 0 and 0 respectively. If 8b=5c and C=2B, then cosC=?

July 25(th)

July, 25

(c) plus or minus 7/25

Decision 24/25

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