_,42*66*58=
问题描述:
_,42*66*58=
这是脱式计算题
答
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