(78.6-0.786×25十75%×21.4)÷15×2011=_.
问题描述:
(78.6-0.786×25十75%×21.4)÷15×2011=______.
答
(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,
=100×0.75÷15×2011,
=75÷15×2011,
=5×2011,
=10055.
故答案为:10055.