0.7x+x=4.5x 解方程
人气：185 ℃ 时间：2019-12-13 17:55:13
解答
0.7x + x = 4.5x
0.7x + x - 4.5x = 0
(0.7 + 1 - 4.5)x = 0
-2.8x = 0
x = 0
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