[toán 9] vio vòng 9

L

lp_qt

$y=3-|x-2|$

$B=y \cap Ox \rightarrow B(0;1)$

$C=y \cap Oy \rightarrow \begin{bmatrix} C(5;0) & \\ C(-1;0)& \end{bmatrix}$

$y=3-|x-2| \le 3 \rightarrow A(2;3)$

tinh dien tich dua vao cong thuc He-rong: $S=\sqrt{p(p-a)(p-b)(p-c)}$
 
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