Question

culegere pag 69 ex 12

Answer 1

a) { 5+67:[100-(60:3-27:3)-22]}x48=
{ 5+67:[100-(20-9)-22]}x48=
[ 5+67:(100-11-22)]x48=
[ 5+67:(89-22)]x48=
( 5+67:67)x48=
( 5+1)x48=
6x48=
288

b) 100-{62-3x[12:(5:5+3)+48:4-1]}x5+1=
 100-{62-3x[12:(1+3)+12-1]}x5+1=
 100-[62-3x(12:4+11)]x5+1=
 100-[62-3x(3+11)]x5+1=
 100-(62-3x14)x5+1=
 100-(62-42)x5+1=
 100-20x5+1=
 100-100+1=
1

c) {[ 5:(2x3-1)+14]:15+3:[1+2x(45:15-2)]}:2=
{[ 5:(6-1)+14]:15+3:[1+2x(3-2)]}:2=
[( 5:5+14):15+3:(1+2x1)]:2=
[( 1+14):15+3:(1+2)]:2=
(15:15+3:3):2=
(1+1):2=
2:2=
1
d)5x{55x5-[55x5-55:5)-55+5]}=
5x{275-[(275-11)-55+5]}=
5x[275-(264-55+5)]=
5x[275-(209+5)]=
5x(275-214)=
5x61=
305

e) {[(15x10-98):2+76]x110-220}:500=
 {[(150-98):2+76]x110-220}:500=
[(52:2+76)x110-220]:500=
[(26+76)x110-220]:500=
(102x110-220):500=
(11220-220):500=
11000:500=
22

f) {[(5x10+178)x15+900]:60}:36=
 {[(50+178)x15+900]:60}:36=
 [(228x15+900):60]:36=
 [(3420+900):60]:36=
 (4320:60):36=
72:36=
2