7.0875减去4又3分之2乘0.72加64分之57除2.857.0875-14/3*18/25+57/64*40/57=7.0875-84/25+5/8=7.0875-3.36+0.625=4.35257.0875减去4又3分之2乘0.72加64分之57除2.857.0875-4.6667*0.72+0.8906/1.425=7.0875-3.36+0.625=4.3525
