Question

4,5 și 6 repede vă rog

Answer 1

4. x/2=y/3=z/5=>x=2y/3
z=5y/3
3*2y/3+2y-5y/3=21
2y+2y-5y/3=21
4y-5y/3=21
12y/3-5y/3=21
7y/3=21=>y=21*3/7=9
x=2*9/3=6
z=5*9/3=15

5. y+z=9+15=24
p/100*(y+z)=x
p/100*24=6
p/100=6/24
p/100=1/4
4p=100=>p=100/4=25%

6. (6+9+15)^2=6^2+9^2+15^2+2*6*9+2*9*15+2*6*15
30^2=36+81+225+108+270+180
900=900 (adevărat)