4)56
a) (7503:61+877):500+53•11=
=(123+877):500+53•11=
=1000:500+53•11
=2+583
= 565
La punctul(B) nu stiu
c) 5•230-7•(512:32+2^2)+4687:43=
= 5•230-7•(512:32+8)+4687:43
=5•230-7•(16+8)+4687:43
=5•230-7•24+4687:43
=1150-168+109
=982+109
=1091
La punctul,, D" nush