35*4/7+.045*5/9-3/7*35+4/9*0.45简便算法
问题描述:
35*4/7+.045*5/9-3/7*35+4/9*0.45简便算法
答
35*4/7+.045*5/9-3/7*35+4/9*0.45
=35*4/7-35*3/7+0.45*5/9+0.45*4/9
=35*((4-3)/7)+0.45*((5+4)/9)
=35/7+0.45
=5.45