Question

C și d mersi mult dau coroana

Answer 1

c) 10[10+(10x+10)]=10^3

10+(10x+10)=10^3:10

10+(10x+10)=10^2

10x+10=100-10

10x+10=90

10x=90-10

10x=80

x=80:10

x=8

d)[(3+x:2):11+7]*5-13=37

[(3+x:2):11+7]*5=37+13

[(3+x:2):11+7]=50:5

(3+x:2):11+7=10

(3+x:2) :11=3

3+x:2=3*11

x:2=33-3

x=30:2

x=15