12. Calculează.
a) {5 + 67 : [100 - 60 : 3 - 27 : 3) - 22]} x 48 =
b) 100 - {62 - 3 x [12: (5:5 + 3) + 48:4 – 1]} x 5 + 1 =
c) {[5: (2 x 3 - 1) + 14] : 15 + 3 : [1 + 2 x (45 : 15 - 2)]} : 2 =
d) 5 x {55 x 5 - [(55 x 5 - 55 : 5) - 55 + 5]} =
e) {[(15 x 10 -98): 2 + 76] x 110 - 220): 500 =
f) {[(5 x 10 + 178) x 15 + 900] : 60} : 36 = ajutor dau coroana
Răspunsuri la întrebare
Explicație pas cu pas:
a) {5+67÷[100-(60÷3-27÷3)-22]}×48=
{5+67÷[100-(20-9)-22]}×48=
[5+67÷(100-11-22)]×48=
[5+67÷(89-22)×48=
(5+67÷67)×48=
(5+1)×48=
6×48=288
b) 100-{62-3×[12÷(5÷5+3)+48÷4-1]}×5+1=
100-{62-3×[12÷(1+3)+48÷4-1]}×5+1=
100-[62-3×(12÷4+12-1)]×5+1=
100-[62-3×(3+11)]×5+1=
100-(62-3×14)×5+1=
100-(62-42)×5+1=
100-20×5+1=
100-100+1=1
c) {[5÷(2×3-1)+14]÷15+3÷[1+2×(45÷15-2)]}÷2=
{[5÷(6-1)+14]÷15+3÷[1+2×(3-2)]}÷2=
[(5÷5+14)÷15+3÷(1+2×1)]÷2=
[(1+14)÷15+3÷(1+2)]÷2=
(15÷15+3÷3)÷2=
(1+1)÷2=
2÷2=1
d) 5×{55×5-[(55×5-55÷5)-55+5]}=
5×{55×5-[(275-11)-55+5]}=
5×[55×5-(264-55+5)]=
5×[55×5-(209+5)]=
5×(55×5+214)=
5×(275+214)=
5×489=2445
e) {[(15×10-98)÷2+76]×110-220}÷500=
{[(150-98)÷2+76]×110-220}÷500=
[(52÷2+76)×110-220]÷500=
[(26+76)×110-220]÷500=
(102×110-220)÷500=
(11220-220)÷500=
11000÷500=22
f) {[(5×10+178)×15+900]÷60}÷36=
{[(50+178)×15+900]÷60}÷36=
[(228×15+900)÷60}÷36=
[(3420+900)÷60]÷36=
(4320÷60)÷36=
72÷36=2