matematika 1-5 pakai cara, Tolong bantu

3.)V= 1/2×10×16×40
V= 1/2×160×40
V= 1/2×6.400
V =3.200

4.) V= 14×10×6
V= 14×60
V= 1.020

5.) V= 12×12×12
V= 1.704


Maaf kalau salah...