84(4\19)*1.375+105(5\19)*0.9
问题描述:
84(4\19)*1.375+105(5\19)*0.9
简算!
答
84又4/19×1.375+105又5/19×0.9
=(85-5/19)*1.375+(105+5/19)*0.9
=85*1.375-5/19*1.375+105*0.9+5/19*0.9
=85*11/8+94.5-5/19*0.475
=210.25