Toán Lớp 9: $Cho$ $0$ $≤$ $a$ $,$ $b$ $,$ $c$ $≤$ $2$ $.$ $Tìm$ $giá$ $trị$ $lớn$ $nhất$ $của$ $biểu$ $thức:$ $A$ $=$ $a^{2}$ $+$ $b^{2}$ $+$ $c^{2}$
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Toán Lớp 9: $Cho$ $0$ $≤$ $a$ $,$ $b$ $,$ $c$ $≤$ $2$ $.$ $Tìm$ $giá$ $trị$ $lớn$ $nhất$ $của$ $biểu$ $thức:$ $A$ $=$ $a^{2}$ $+$ $b^{2}$ $+$ $c^{2}$
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