已知 integrate from 0 to 5 of f(x) dx = 12 和 integrate from 0 to 2 of f(x) dx = 5 ，计算 。已知 integrate from 0 to 5 of f(x) dx = 12 和 integrate from 0 to 2 of f(x) dx = 5 ，计算 。

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