Question

4,5 si 6,va rog mult​

Answer 1

Explicație pas cu pas:

4)

5•(x+y)=4•(2x+y)

5x+5y=8x+4y

5y-4y=8x-5x

y=3x

y/x=3

x/y= 1/3

5)

25/100•y=17

25/100=17/y

y•25=17•100

y=1700:25

y=68

6)

x/3=y/4 => x=3y/4

3x+4y=75

3•3y/4+4y=75

9y/4+4y=75

9y+16y=300

25y=300

y=300:25

y=12

x=3y/4

x=3•12/4

x=9