Question

Pliz ajutațimă!!!! Ex 28 şi 29!!!

Answer 1

Răspuns:

28.

a) x=8 y=3

8............3

12(x)........y y=12×3/8=36:8=4,5

b)8..........3

2..........y y=2×3/8=0,75

c)8...........3

x.........30 x=8×30/3=80

d)8...........3

x..........0.9 x=8×0.9/3=7,2/3=2,4

29.

a)u=12 v=20

12...........20(v)

5..............v(20) v=20×12/5=240/5=48

b)12..........20(v)

8................v(20) v=20×12/8=240/8=30

c)12...........20(60)

u.................60(20) u=12×20/60=240/60=40

d)12......20(3)

u............3(20) u=12×20/3=240/3=80