X等于几?(13.57*24)+(X*7)/31=13.0 附算法[(13.57*24)+(X*7)]/31=13
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![X等于几?(13.57*24)+(X*7)/31=13.0 附算法[(13.57*24)+(X*7)]/31=13](/uploads/image/z/5378881-49-1.jpg?t=X%E7%AD%89%E4%BA%8E%E5%87%A0%3F%EF%BC%8813.57%2A24%EF%BC%89%2B%EF%BC%88X%2A7%EF%BC%89%2F31%3D13.0+%E9%99%84%E7%AE%97%E6%B3%95%5B%EF%BC%8813.57%2A24%EF%BC%89%2B%EF%BC%88X%2A7%EF%BC%89%5D%2F31%3D13)
X等于几?(13.57*24)+(X*7)/31=13.0 附算法[(13.57*24)+(X*7)]/31=13
X等于几?(13.57*24)+(X*7)/31=13.0 附算法
[(13.57*24)+(X*7)]/31=13
X等于几?(13.57*24)+(X*7)/31=13.0 附算法[(13.57*24)+(X*7)]/31=13
x=(13x31-13.57x24)/7
=(403-325.68)/7
=77.32/7
=11.045