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b=10-2y
h=y
V=abh
V=(25-2y)(10-2y)*y
V=(250 -50y -20y +4y²)y
V=250y -70y²+4y³
V=4y³ -70y²+250y
y=4
V=4*4³-70*4²+250*4
V=256 -1120+1000
V=136 [j³]