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| rev | Admin | (Created page with "'''Key: A''' <math display="block">\begin{aligned} B & =\left\{\begin{array}{cc} c(400-x) & x<400 \\ 0 & x \geq 400 \end{array}\right. \\ 100 & =\operatorname{E}(B)=c 400-c \...") | May 13'23 at 19:00 | +373 |