简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42.5+24.4/16 0.8*(13-2.53/18)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/11 17:21:39
简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42.5+24.4/16 0.8*(13-2.53/18)

简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42.5+24.4/16 0.8*(13-2.53/18)
简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42.5+24.4/16 0.8*(13-2.53/18)

简便计算 99*2.5+2.5 6.4*4.5+3.6*4.5 6.25/0.25+0.75 99*2.5+2.5 42.5+24.4/16 0.8*(13-2.53/18)
.87×0.25+0.087×7.5
=0.87×0.25+0.87×0.75
=0.87×(0.25+0.7)
=0.87

1)99*2.5+2.5=100*2.5=250
2)6.4*4.5+3.6*4.5=10*4.5=45
3)6.25/0.25+0.75=6.25*4+0.75=25.75
4)42.5+24.4/16=42.5+6.1/4=44.025