1.Aflati termenii necunoscuti ai proportiilor :
a)5 supra x = 20 supra 7
b)x+1 supra 3 = 10 supra 9

2
a )x= 5*7 supra 20 =35 supra 20
5/x=20/7 => x = 5*7/20 x= 7/4
30/20=1,7(5) fals, la fel ai gresit si la al II ex.Gabriela!

Răspunsuri

2014-05-18T16:06:37+03:00
A) x=5*7/20=1,7(5) 
b) x+1=10*3/9=3,3(3)
x=3,3(3)-1=2,3(3)

2014-05-18T16:07:52+03:00
5/x=20/7
20x=5·7
20x=35
x=35/20 simplificam=7/4=1,75
b)⇒9(x+1)=3·10
9x+1=30
9x=30-1
9x=29
x=29/9=3,(2)