42*66*58
=42×58×66
=（50-8）×（50+8）×66
=（50²-8²）×66
=（2500-64）×66
=2500×66-64×66
=（2500×4）×（66÷4）-4224
=10000×16.5-4224
=165000-4224
=160776谢谢你