140X+20X=400求解题步骤急!
问题描述:
140X+20X=400求解题步骤急!
答
140X+20X=400
合并同类项得:
(140+20)X=400
160X=400
解得:X=400/160
X=5/2
答
(140+20)X=400
160X=400
X=400/160=5/2
答
140X+20X=400
(140+20)X=400
160X=400
X=400/160
X=5/2