$3\right)$ Suponga $yg$ son integrables $y$ que: $\int _{1} ^{2}f\left(x\right)dx=-4$ $\int _{1} ^{5}f\left(x\right)dx=6$ $\int _{1} ^{5}g\left(x\right)dx=8$ $Encuentre$ $\int _{2} ^{2}g\left(x\right)dx$ $\int _{1} ^{2}3f\left(x\right)dx$ $\int _{1} ^{5}\left(f\left(x\right)-g\left(x\right)\right)dx$ $\int _{5} ^{1}g\left(x\right)dx$ $\int _{2} ^{5}f\left(x\right)dx$ $\int _{1} ^{5}\left(4f\left(x\right)-g\left(x\right)\right)dx$