(78.6-0.786×25+75%×21.4)÷15×1997
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![(78.6-0.786×25+75%×21.4)÷15×1997](/uploads/image/z/202130-26-0.jpg?t=%2878.6%EF%BC%8D0.786%C3%9725%EF%BC%8B75%25%C3%9721.4%29%C3%B715%C3%971997)
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(78.6-0.786×25+75%×21.4)÷15×1997
(78.6-0.786×25+75%×21.4)÷15×1997
(78.6-0.786×25+75%×21.4)÷15×1997
原式=(78.6-78.6×0.25+0.75×21.4)÷15×1997
=[78.6×(1-0.25)+0.75×21.4)]÷15×1997
=[78.6×0.75 +0.75×21.4]÷15×1997
=[78.6+21.4]×0.75÷15×1997
=100×0.75÷15×1997
=5×1997
=5×(2000-3)
=5×2000-15
=9985
=((0.786(100-25)+75*0.214)/15*1997
=75/15*1997
=5*1997
=9985