2.07÷0.23÷0.45=9÷0.45=207.28+3.2÷2.5=7.28+1.28=8.56
7.28+3.2÷2.5=7.28+1.28=8.56四舍五入哗卖御看你保留几位小数,如保留一位乱岩就是配戚8.6