Tính

a) 27.34 + 27.67 – 27 b) 112 – 12.8 c) {[(20 – 2.3).5] – 2.5}:^2 + (4.5)2 d) (1^2 + 2^2 + 3^2 + ….+2022^2 ).(2^4 - 4 ^2) )