Recent Content by xuandieuatk

Cho \(\int\limits_0^9 {f\left( x \right)} dx = 9\). Tính \(\int\limits_0^3 {f\left( {3x} \right)dx} .\) A. \(\int\limits_0^3 {f\left( {3x} \right)dx} = 1\) B. \(\int\limits_0^3 {f\left( {3x} \right)dx} = - 3\) C. \(\int\limits_0^3 {f\left( {3x} \right)dx} = 3\) D. \(\int\limits_0^3...