cho a+b=c+d=1000. tìm max $\frac{a}{c}+\frac{b}{d}$
tìm max $\frac{a}{c}+\frac{b}{d}$
Started By ILoveMath4864, 06-09-2016 - 21:31
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Posted 06-09-2016 - 21:31
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