Question

Aflati termenul necunoscut din proportiile:
a)5/8=15/x
b)7/12=x/36
c)x/4=152/16
d)x/13=112/91
e)x/21=231/441
f)x/17=255/289
g)x/18=342/324
h)391/529=x/23

Answer 1

a) 5/8=15/x=
x·5=15·8=
x·5=120
x=120:5
x=24

b)7/12=x/36=
x·12=7·36=
x·12=252
x=252:12
X=21