求3.6x42.3x3.75-12.5x0.423x28的简便运算
问题描述:
求3.6x42.3x3.75-12.5x0.423x28的简便运算
答
3.6x42.3x3.75-12.5x0.423x28
=1.08x42.3x12.5-12.5x42.3x0.28
=42.3×12.5×(1.08-0.28)
=42.3×12.5×0.8
=42.3×10
=423