Trần Khả Nam
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2025-02-02 10:33:16
\(\frac{10}{3}x+\frac{67}{4}=-13,25\)
\(\frac{10}{3}x+16,75=-13,25\)
\(\frac{10}{3}x=-13,25-16,75\)
\(\frac{10}{3}x=-30\)
\(x=-30\) : \(\frac{10}{3}\)
\(x=-9\)
Vậy \(x=-9\)
2025-02-01 18:51:57
\(A=1+3+3^2+\cdots+3^{2021}\)
\(3A=3+3^2+3^3+\cdots+3^{2022}\)
\(3A-A=\left(3+3^2+3^3+\cdots+3^{2022}\right)-\left(1+3+3^2+\cdots+3^{2021}\right)\)
\(2A=3^{2022}-1\)
\(A=\frac{3^{2022}-1}{2}\)