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3=4r²+2rh
h=2
4r²+4r-3=0
Δ=16+48=64
√Δ=8
r=(-4+8):8
r=½
V=4/3πr³+πr²h
V=4/3π×⅛+π×¼×2
V=⅙π+½π
V=⅔πm³
V=666⅔πdm³=666⅔πl