a) 100 : (4 x 5 ) + 75 x (2 + 7) = 680
100:20+75x9=680
5+675=680(A)
b)4 x 7 x 25 - 100 x 2 : 2 = 600
700-100=600(A)
c) 4 x 75 + 8 : ( 3 + 1 ) x 2 = 604
300+1=301
Rezultatul,este,fals.
d) [(21 + 42 ) x 3 ] x [4 x ( 18 + 12 )] = 150
(63x3)x(4x30)=150
189x120=22680
Rezultatul,este,fals.