Question

Afla x din propozițiile
12/15=x/15
28/x=21/7
x/125=12/25
12/17=6/x
2×2/1 totul supra x = 20/1/35
x/3=12/1
0,3/x/2=x/2/2,7
0,(3)/0,1(6)=x/2,5
x-5/x+3=2/3
3x-7/5=2×-6/3
/=supra ​

Answer 1

12/15=x/15=>×=12×15÷15=>x=12

28/x=21/7=>28/x=3=>x=9,(3)

x/125=12/25=>x/5=12=>x=60

4/x=20/35

x×20=4×35=>x×20=140=>x=7

x/3=12=>x=12×3=>x=36