oblicz: y/5=15/3 POMÓŻCIE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
y/5 = 15/3
(mnożymy na krzyż) 3y = 15 * 5
3y = 75 / : 3
y = 25
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y/5 = 15/3
(mnożymy na krzyż)
3y = 15 * 5
3y = 75 / : 3
y = 25