Question

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

Answer 1

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=5.84.25/2.5*（10-0.1）+0.17=1.7×9.9+0.17=0.17×99+0.17=0.17×（99+1）=0.17×100=17