可以简便的简便计算;99.9*7+11.1*27 0.5/0.25+0.95/0.25 4.25/2.5*(10-0.1)+0.17
问题描述:
可以简便的简便计算;99.9*7+11.1*27 0.5/0.25+0.95/0.25 4.25/2.5*(10-0.1)+0.17
答
99.9*7+11.1*27
=11.1×9×7+11.1×27
=11.1×(63+27)
=11.1×90
=999
0.5/0.25+0.95/0.25
=2+3.8
=5.8
4.25/2.5*(10-0.1)+0.17
=1.7×9.9+0.17
=0.17×99+0.17
=0.17×(99+1)
=0.17×100
=17