Question

Determinați termenul necunoscut x din proporțiile:
a) x/2,8=1,05/0,7
b)14/x=3,1/0,54
c)0,42/1,5=x/35
d)2,8/0,84=16/x
e)24/7=21/x
f)5/27=x/36
g)5x/4=13/2
h)12/5=4x/7
VA ROG DAU COROANA!!!!​

Answer 1

Răspuns:

a) x/2,8=1,05/0,7

0,7x=2,8×1,05=>x=4,2

b) 14/x=2,1/0,54

2,1x=14x0,54=>x=3,6

c) 0,42/1,5=x/35

1,5x=0,42x35=>x=9,8

d) 2,8x=0,84x16=>x=4,8

e) 24/7=21/x

24x=7×21=>x=147:24=>x=6,125

f) 5/27=x/36

27x=5×36=>x=180:27=>x=6,(6)

g)5x/4=13/2

10x=4×14=>x=56:10=>x=5,6

h)12/5=4x/7

20x=12×7=>x=84:20=>x=4,2