Tema 2: Propiedades de la adición. 1. Completa para que se cumpla la propiedad en cada caso.
a) 15+
=7+
b) 25+15=15+
c) 125+100=
+
d) 300+
=400+
e) 500+360=
+
f) 221+
+25

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.