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数学
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7/4x-1/2x=6.26 7x+402x乘2=21 解方程
人气：129 ℃ 时间：2020-05-15 17:11:14
解答
两边乘以20
35x-10x=125.2
25x=125.2
x=5.008
7x+402x*2=21
811x=21
x=38.62
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