minhphuong4287 minhphuong4287

21-02-2024
Mathematics

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a) Cho biết a =2+\sqrt{3} và \mathrm{b}=2-\sqrt{3}. Tính giá trị biểu thức: \mathrm{P}=\mathrm{a}+\mathrm{b}-\mathrm{ab}.

b) Giải hệ phương trình: \left\{\begin{array}{l}3 x+y=5 \\ x-2 y=-3\end{array}\right..

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