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,繁荣的菜市场,0.1250.8=,1.258=,2.50.4=,50.4=,20+0.29=,6270+2.7=,0.4(25+2.5),0.425,0.42.5,+,=,=10+1,=11,12.516+12.584,=12.5100,12.5,=,(16+84),=1250,1元=()角,1角=()分,繁荣的菜市场,舍零钱现象,凑整钱现象,估算,