题目内容
计算：（78.6-0.786×25+75%×21.4）÷15×2009=______．
（78.6-0.786×25+75%×21.4）÷15×2009，
=（78.6×1-78.6×0.25+0.75×21.4）÷15×2009，
=[78.6×（1-0.25）+0.75×21.4]÷15×2009，
=[78.6×0.75+0.75×21.4]÷15×2009，
=[0.75×（78.6+21.4）]÷15×2009，
=[0.75×100]÷15×2009，
=75÷15×2009，
=5×2009，
=10045．
故答案为：10045．
=（78.6×1-78.6×0.25+0.75×21.4）÷15×2009，
=[78.6×（1-0.25）+0.75×21.4]÷15×2009，
=[78.6×0.75+0.75×21.4]÷15×2009，
=[0.75×（78.6+21.4）]÷15×2009，
=[0.75×100]÷15×2009，
=75÷15×2009，
=5×2009，
=10045．
故答案为：10045．
练习册系列答案
相关题目