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(78.6-0.786×25十75%×21.4)÷15×2011=______.
(78.6-0.786×25十75%×21.4)÷15×2011=______.
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2020-06-11 10:04
(78.6-0.786×25十75%×21.4)÷15×2011=______.
(78.6-0.786×25十75%×21.4)÷15×2011=______.
(78.6-0.786×25十75%×21.4)÷15×2011=(78.6-78.6×0.25+75%×21.4)÷15×2011,=[(1-0.25)×78.6+0.75×21.4]÷15×2011,=[0.75×78.6×0.75×21.4]÷15×2011,=(78.6+21.4)×0.75÷15×2011,=100×0....