a: \(\left(-305\right)+400+305\)
\(=\left(-305+305\right)+400\)
=0+400
=400
b: \(\left(-511\right)-\left(-11\right)\)
=-511+11
=-(511-11)
=-500
c: \(0-\left(12345+15\right)\)
\(=0-12360\)
=-12360
d: \(333-\left[\left(-14657\right)+57\right]-78\)
\(=333+14657-57-78\)
\(=\left(333-78\right)+14600\)
\(=255+14600=14855\)