Jaką długość ma odcinek x ?
20:x=(20+16) :(x+12)
20:x= 36:(x+12)
20 36
--- = ----
x x+12
20x+240= 36x (mnożenie na krzyż)
20x+240= 36x |-20x
240= 16x |:16
x= 15
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20:x=(20+16) :(x+12)
20:x= 36:(x+12)
20 36
--- = ----
x x+12
20x+240= 36x (mnożenie na krzyż)
20x+240= 36x |-20x
240= 16x |:16
x= 15