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| rev | Admin | (Created page with "'''Key: E''' <math display = "block"> f(x) = \begin{cases} =0.01, \quad 0 \leq x \leq 80 \\ =0.01-0.00025(x-80)=0.03-0.00025 x, \quad 80 < x \leq 120 \\ \end{cases} </math...") | May 14'23 at 16:16 | +947 |