Tính nguyên hàm \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqefm0B1jxALjhiov2D % aerbdfgBPjMCPbqeeuuDJXwAKbsr4rNCHbGeaGqiVu0Je9sqqrpepC % 0xbbL8F4rqqrFfpeea0xe9Lq-Jc9vqaqpepm0xbba9pwe9Q8fs0-yq % aqpepae9pg0FirpepeKkFr0xfr-xfr-xb9adbaqaaeGaciGaaiaabe % qaamaaeaqbaaGcbaWaa8qaaeaadaWcaaqaaiaaigdaaeaacaaIXaGa % ey4kaSIaamiEaaaacaWGKbGaamiEaaWcbeqab0Gaey4kIipaaaa!4434! \int {\frac{1}{{1 + x}}dx} \)

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