数学简便运算.85×99
问题描述:
数学简便运算.85×99
答
85x(100-1)=85x100-85x1=8500-85=8415
答
8415
答
85*99
=85*(100-1)
=85*100-85
=8500-85
=8415
答
85×99
=85×(100-1)
=85×100-85
=8415
答
85×99
=85×(100-1)
=85×100-85
=8500-85
=8415
答
85×99
=85×(100-1)
=85×100-85×1
=8500-85
=8500-(100-15)
=8500-100+15
=8400+15
=8415
答
85×(99+1)-85