34.7*69+65.3*31+30.6*19怎么用简便方法计算
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![34.7*69+65.3*31+30.6*19怎么用简便方法计算](/uploads/image/z/128324-20-4.jpg?t=34.7%2A69%2B65.3%2A31%2B30.6%2A19%E6%80%8E%E4%B9%88%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97)
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34.7*69+65.3*31+30.6*19怎么用简便方法计算
34.7*69+65.3*31+30.6*19怎么用简便方法计算
34.7*69+65.3*31+30.6*19怎么用简便方法计算
34.7*69+65.3*31+30.6*19
=34.7*69+34.7*31+30.6*31+30.6*19
=100*34.7+50*30.6
=3470+1530
=5000