(78.6-0.786/25+75%/21.4)*15/2011
问题描述：
(78.6-0.786/25+75%/21.4)*15/2011
答
(78.6-0.786*25+75%*21.4)/15*2011=（78.6-78.6x0.25+0.75x21.4）÷15x2011=[78.6x(1-0.25)+0.75x21.4]÷15x2011=(78.6x0.75+0.75x21.4)÷15x2011=0.75x(78.6+21.4)÷15x2011=0.75x100÷15x2011=5x2011=10055