30cm*40cm*x = 12dm³
3dm*4dm*x = 12dm³
12dm²*x = 12dm³ |:12dm²
x = 1dm
x = 10cm
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30cm*40cm*x = 12dm³
3dm*4dm*x = 12dm³
12dm²*x = 12dm³ |:12dm²
x = 1dm
x = 10cm
12l=12dm³12000cm³
V=Pp*h
h=V/Pp
h=12000cm³/1200cm²
h=10cm
30×40=1200 cm²=12dm²
12×x=12 bo 1l to 1 dm³
czyli
x=12/12=1dm