tinh A=11.32.37-915 / (2.314)2
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31 tháng 10 2021
\(2x+1=9\\ \Leftrightarrow2x=8\\ \Leftrightarrow x=4\)
\(15-3x=3\\ \Leftrightarrow3x=12\\ \Leftrightarrow x=4\)