(78.6—0.786×25十75%×21.4)÷15×1997好难啊

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(78.6—0.786×25十75%×21.4)÷15×1997好难啊
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(78.6—0.786×25十75%×21.4)÷15×1997好难啊
(78.6—0.786×25十75%×21.4)÷15×1997
好难啊

(78.6—0.786×25十75%×21.4)÷15×1997好难啊
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

9985

5711.42

5711.42