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b)chyba 4 odp
c)1odp
d)
e)7.2/3=x/8.5
7,2*8.5=3x
61.2=3x
x=20,4m
1.D
2.
2-x*5=3*4
2-5x=12
-3x=12//-3
x=-4
3.C
4:B
5.D
6.B
7.C
8.C
9.B