0.75x+0.5×0.75=1解：0.75x+0.375=1 0.75x=0.625 x=0.625÷0.75 x=5/6行家正解，不明白可以追问！祝您学习进步满意请点击下面的【选为满意回答】按钮，O(∩_∩)O谢谢
