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Aflati numarul X pentru care:
a)3/X=4/8
b)X/7=3/1
c)X/2=9/3
d)4/12=1/X


Răspuns :

a) x=3*8/4
x=24/4
x=6
b)x=7*3
x=21
c) x=2*9/3
x=18/3
x=6
d)x=12/4
x=3

a=3x8:4

a=24:4

a=6

b=7x3:1

b=21

c=9x2:3

c=6

d=12x1:4

d=3