( đúng hay sai) tích phân xf(x)dx=1/2xe^2x-1/2e^2x+c

d) Sai vì \(\int {xf(x)dx = \int {x{e^{2x}}} dx = \frac{1}{2}x{e^{2x}} - \int {\frac{1}{2}{e^{2x}}dx = \frac{1}{2}x{e^{2x}} - \frac{1}{4}{e^{2x}} + C} } \)