Question

a) 93 : 3 + 41 ∙ 5 – 45 : 9 + 28 : 7 + 81 : 3 – 2 ∙ 6;
b) {7 + 7 ∙ [7 + 3 ∙ (5 + 225 : 15 - 15)]} – 161;
c) 10 ∙ {2 + 10 ∙ [126 + 10 ∙ (24 + 24 : 2 - 6)]} – 42 600.

Answer 1

Rezolvare :
a) 31+205-5+4+27-26=
=236-5+4+27-26
=231+4+27-26
=235+27-26
=262-26
=236
b){7+7×[7+3 ×(5+15-15)]}-161=
={7+7 ×[7+3 ×(20-15)]}-161
=[7+7 ×(7+3×5)]-161
=[7+7 ×(7+15)]-161
=(7+7×22)-161
=(7+154)-161
=161-161
=0
c) 10×{2+10×[126+10×(24+12-6)]}-42600=
=10×{2+10×[126+10×(36-6)]}-42600
=10×[2+10×(126+10×30)]-42600
=10×[2+10×(126+300)]-42600
=10×(2+10×426)-42600
=10×(2+4260)-42600
=10×4262-42600
=42620-42600
=20