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V1 = 864cm³
V2 = 864cm³*(100%+20%)
V2 = 864cm³*1,2
V2 = 1036,8cm³
H2 = 1036,8cm³:72cm²
H2 = 14,4cm
14,4cm-12cm = 2,4cm
liczę na najlepszą, pozdrawiam : )
1,2*864cm3=1036,8cm3
1036,8cm3:72cm²=14,4cm
14,4cm-12cm=2,4cm
v= 864
100%-864
120%-x
120*864/100 = 1036,8
1036,8/72 = 14,4
Odp. o 2,4 cm.