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Aflati termenul necunoscut din urmatoarele proportii:
a)x/3=5/1
b)4/x=9/5
c)11/=x/10
d)4/13=1/x


Răspuns :

a) x/3=5/1
x=3×5
x=15

b)4/x=9/5
9×x=4×5
9×x=20
x=20/9

c)11=x/10
x/10=11
x=11×10
x=110

d)4/13=1/x
4×x=13
x=13/4

a)
x/3=5/1=>x=3×5/1=>x=15
b)
4/x=9/5=>x=4×5/9=>x=20/9
c)
11=x/10=>x=11×10=>x=110
d)
4/13=1/x=>x=1×13/4=>x=13/4