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2 năm trước
Cho phương trình $e^{mcosx-sinx}$ - $e^{2(1-sinx)}$ =$2-sinx-mcosx$ với $m$ là tham số thực . Gọi $S$ là tập tất cả các giá trị của $m$ để phương trình có nghiệm. Khi đó $S$ có dạng $(-∞;a]∪ [b;+∞)$. Tính $T$= $10a+20b$ $A$. $T$=$10\sqrt{3}$ $B$. $T$= $0$ $C$. $T$= $1$ $D$. $T$=$3\sqrt{10}$
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