a=6
b=8
a1=a-y=6-y
b1=b-y=8-y
h=y
V=abh
V=(6-y)(8-y)y
y=2
V=(6-2)(8-2)*2=4*6*2
V=48
lub
V=(6-y)(8-y)*y=(48-6y-8y+y^2)*y=48y-14y^2+y^3
V=y^3-14y^2+48y
8-14*4+96=8-56+96=48
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a=6
b=8
a1=a-y=6-y
b1=b-y=8-y
h=y
V=abh
V=(6-y)(8-y)y
y=2
V=(6-2)(8-2)*2=4*6*2
V=48
lub
V=(6-y)(8-y)*y=(48-6y-8y+y^2)*y=48y-14y^2+y^3
V=y^3-14y^2+48y
y=2
8-14*4+96=8-56+96=48
V=48