14×7????2.8-0.4????1.2×0.5???0.12÷4????0.22×0.2????0.15÷0.3??43+15????2.2-1.5????0.46+0.6???2-1.7????4.1+0.04????3.5-3???20+160????210÷30????30×20???600÷20????21×40???110-60???44×25????201×14????5××20%????50%+5-×8????×7????×9．
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解：14×7=98???2.8-0.4=2.4????1.2×0.5=0.6???0.12÷4=0.03???0.22×0.2=0.044????0.15÷0.3=0.5??43+15=58????2.2-1.5=0.7????0.46+0.6=1.06???2-1.7=0.3????4.1+0.04=4.14????3.5-3=0.5???20+160=180????210÷30=7????30×20=600???600÷20=30????21×40=840???110-60=50???44×25=1100????201×14=2814????=====5××20%=???50%+=15-×8=???×7=10????×9=
解析分析：根据整数、分数、小数和百分数加减乘除法的运算方法进行解答即可．
点评：此题考查了四则运算的口算方法和口算能力，认真计算即可．