Câu hỏi:

Với số thực dương \(a,b,c\) thỏa mãn \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaaiaaikdaaeqaaOGaamyyaiabg2da9iaadoga % aaa!3C89! {\log _2}a = c\) và \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaaiaaikdaaeqaaOGaamOyaiabg2da9iaaikda % caWGJbaaaa!3D46! {\log _2}b = 2c\). Giá trị của a bằng

A. \(\sqrt{b}\)

B. \(2c\)

C. \(b^2\)

D. \(\frac{b}{2}\)

Câu 1:

Phương trình \(\log_2(x-3)=3\) có nghiệm là

A. \(5\)

B. \(12\)

C. \(9\)

D. \(11\)

Câu 2:

Tập hợp tất cả tham số m để hàm số \(y=x^3+(m+1)x^2+3x+2\) đồng biến trên \(\mathbb{R}\) là

A. \([-4;2]\)

B. \((-4;2)\)

C. \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 % qadaqadaqaaiabgkHiTiabg6HiLkaacUdacqGHsislcaaI0aaacaGL % OaGaayzkaaGaeyOkIG8aaeWaaeaacaaIYaGaai4oaiabgUcaRiabg6 % HiLcGaayjkaiaawMcaaaaa!435B! \left( { - \infty ; - 4} \right] \cup \left[ {2; + \infty } \right)\)

D. \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8 % qadaqadaqaaiabgkHiTiabg6HiLkaacUdacqGHsislcaaI0aaacaGL % OaGaayzkaaGaeyOkIG8aaeWaaeaacaaIYaGaai4oaiabgUcaRiabg6 % HiLcGaayjkaiaawMcaaaaa!435B! \left( { - \infty ; - 4} \right) \cup \left( {2; + \infty } \right)\)

Câu 3:

Biết rằng phương trình \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaciiBaiaac+ % gacaGGNbWaaSbaaSqaaiaaikdaaeqaaOGaamiEaiabgUcaRiGacYga % caGGVbGaai4zamaaBaaaleaacaaIZaaabeaakiaadIhacqGH9aqpca % aIXaGaey4kaSIaciiBaiaac+gacaGGNbWaaSbaaSqaaiaaikdaaeqa % aOGaamiEaiaac6caciGGSbGaai4BaiaacEgadaWgaaWcbaGaaG4maa % qabaGccaWG4baaaa!4D28! {\log _2}x + {\log _3}x = 1 + {\log _2}x.{\log _3}x\) có hai nghiệm \(x_1; x_2\). Giá trị của \(x_1^2+x_2^2\) là

A. \(5\)

B. \(13\)

C. \(25\)

D. \(2\)

Câu 4:

Có bao nhiêu giá trị nguyên của tham số \(m\,\,(|m|<10)\)  để phương trình \(2^{x-1}=log_4{(x+2m)}+m\) có nghiệm

A. \(9\)

B. \(10\)

C. \(5\)

D. \(4\)

Câu 5:

Cho hàm số \(f(x)\) thỏa mãn \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qCaeaaca % WGMbGaaiikaiaadIhacaGGPaGaamizaiaadIhacqGH9aqpcaaIXaGa % aG4naaWcbaGaaGimaaqaaiabgkHiTiaaikdaa0Gaey4kIipaaaa!4268! \int\limits_0^{ - 2} {f(x)dx = 17} \) và \(\int\limits_0^{ 2} {f(x)dx = 4} \). Giá trị của \(\int\limits_{-2}^{ 2} {f(x)dx} \) bằng 

A. \(21\)

B. \(0\)

C. \(-21\)

D. \(-13\)

Câu 6:

Cho hàm số \(f(x)\). Hàm số \(y=f'(x)\) có bảng xét dấu như sau

\(\begin{array}{c|c} x & -\infty\,\,\,\,\,\,\,\,\,\,\,\,-2 \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1 \,\,\,\,\,\,\,\,\,\,\,\,\,\,\ 3 \,\,\,\,\,\,\,\,\,\,\,\,+\infty \\ \hline f'(x) &\,\,\,\, - \,\,\,\,\,\,0 \,\,\,+\,\,\,\,\,\, 0 \,\,\,\,\,+\,\,0 \,\,\,\,\,\,- \end{array}\)

Số điểm cực tiểu của hàm số \(y=f(x^2+3x)\) là

A. \(5\)

B. \(4\)

C. \(3\)

D. \(2\)