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dane: a=25m, b=15m, h1=2,05m, h2=1,45m, d=1000kg/m3
szukane: V, m
hśr = [h1+h2]/2 = [2,05m + 1,45m]/2 = 1,75m
V = 25m*15m*1,75m = 656,25m3
m = d*V = 1000kg/m3*656,25m3 = 656 250kg = 656,25 t wody
...................pozdrawiam
2.05m+1.45m=3.5m, 3.5m:2=1.75m
1.75m=17.5dm
15m=150dm
25m=250dm
V=axbxc
V-250dmx150dmx17.5dm=656l
100kg/m3=0.1kg/dm3
656l:10=65.6kg