5*6-0.5x=25这道方程怎么解
5*6-0.5x=25、3.1*6+4.2x=31.
人气：237 ℃ 时间：2020-01-31 13:53:43
解答
5*6-0.5x=25 3.1*6+4.2x=31.2
30-0.5x=25 18.6+4.2x=31.2
0.5x=30-25 4.2x=31.2-18.6
0.5x=5 4.2x=12.6
x=2.5 x=0.03
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