Răspuns:
a) x/6=9/27----> aducem la numitor comun (9);(2)
9x/54=18/54==>9x=18 x=18:9 x=2
b)2/3=6/y----> prima fractie o amplificam cu 3
6/9=6/y ==>y=9
c)0,5/3=6/z
5/10 × 1/3 =6/z
5/30= 6/z
z=30×6/5=36
d) a/1,2=10/3
a/6/5=10/3
a/6×1/5=10/3
a=30×10/3=100
e) 2,1/b=7/4
21/10/b=7/4
21/10b=7/4
84=70b
b=6/5
f)1,8/u=1,12/2,52
9/5/u=1,12/2,25
9/5/u=28/25/63/25
9/5u=28/63
9/5u=4/9 simplifica fractia folosind inmultirea pe diagonala
81=20u
u=81/20
g)x+3/6=5/2
2(x+3)=30
x+3=15
x=15-3
x=12
h) 27/42=45/7×x
27/42=45/7x
9/14=45/7x
63x=630
x=10
sper ca ti-a fost de ajutor.
succes!
