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Zad.2. x*1,20=48
x=40
Zad.3. 20*x=23
x=1,15
Odp. 15%
Zad.4.
55*0,88=48,4zł
Zad.5. x*0,92=23
x=25 l
Zad.6.
350*x=266
x=0,76
Odp. Obniżono o 24%