Calculează: a) |+3| × |7-2|=
b)|6-7|×|-4|=
c) |5-7|×(-2)×|6-4|
d)(-|13-17|)×|29-30|
e)|-9+7-18|×|-34+29|×(-1)×(+2)
f)|12-17|18-16|×0