Question

Efectuati calculele :
a) {[(620+880:40):6-(850+350:14):35]x15}:30=
b) {4450-[3600-(3240:36-3850:77)x25]}:50=
c) {[(520+20x9):2x5x10+5x(104-93]:5-511}:100=

Answer 1

a) {[(620+22):6-(850+25):35]×15}:30=

=[(642:6-875:35)×15]:30

=[(107-25)×15]:30

=(82×15):30

=1230:30

=41

b) {4450-[3600-(90-50)×25]}:50=

=[4450-(3600-40×25)]:50

=[4450-(3600-1000)]:50

=(4450-2600):50

=1850:50

=37

c) {[(520+180):2x5x10+5x11]:5-511}:100=

=[(700:2×5×10+55):5-511]:100

=[(350×5×10+55):5-511]:100

=[(17500+55):5-511]:100

=(17555:5-511):100

=(3511-511):100

=300:100

=3