A.  ${\int }_a^{b}f\left(x\right)dx={\int }_a^{c}f\left(x\right)dx+{\int }_c^{b}f\left(x\right)dx$

B. ${\int }_a^{b}f\left(x\right)dx={\int }_a^{b+c}f\left(x\right)dx-{\int }_a^{c}f\left(x\right)dx$

C. ${\int }_a^{b}f\left(x\right)dx={\int }_a^{b+c}f\left(x\right)dx+{\int }_{b+c}^{b}f\left(x\right)dx$

D. ${\int }_a^{b}f\left(x\right)dx={\int }_a^{c}f\left(x\right)dx-{\int }_b^{c}f\left(x\right)dx$

A. -1

B. 0

C. 1

D.-4

A. $\frac{5{\mathrm{\pi }}^2}{36}$

B.  $\frac{5{\mathrm{\pi }}^2}{144}$

C. $-\frac{5{\mathrm{\pi }}^2}{36}$

D.  $-\frac{5{\mathrm{\pi }}^2}{144}$

A. m = 2

B. m = 5

C. Không tồn tại

D. m = -2

A.  ${\int }_a^{b}f\left(u\right(x\left)\right)u\text{'}dx={\int }_{u\left(a\right)}^{u\left(b\right)}f\left(u\right)du$

B.  ${\int }_a^{b}f\left(u\right(x\left)\right)u\text{'}dx={\int }_a^{b}f\left(u\right)du$

C.  ${\int }_{u\left(a\right)}^{u\left(b\right)}f\left(u\right(x\left)\right)u\text{'}dx={\int }_a^{b}f\left(u\right)du$

D.  ${\int }_a^{b}f\left(u\right(x\left)\right)u\text{'}dx={\int }_a^{b}f\left(x\right)dx$

A. m = -2

B. Không tồn tại m

C. m = 1

D. m = 2

A. m = 1

B. Không tồn tại m

C. m = -2

D. m = 2

A.  ${\log }_{abc}x=\alpha +\beta +\gamma$

B.  ${\log }_{abc}x=\alpha \beta \gamma$

C.  ${\log }_{abc}x=\frac{\alpha \beta +\beta \gamma +\gamma \alpha }{\alpha \beta \gamma }$

D.  ${\log }_{abc}x=\frac{\alpha \beta \gamma }{\alpha \beta +\beta \gamma +\gamma \alpha }$

A.   $\frac{x}{-1}=\frac{y+1}{1}=\frac{z}{-1}$

B.   $\frac{x}{1}=\frac{y+1}{1}=\frac{z-1}{1}$

C.   $\frac{x-2}{1}=\frac{y+1}{-5}=\frac{z}{2}$

D.   $\frac{x+2}{1}=\frac{y-1}{-5}=\frac{z}{2}$