解方程；3x（66-3x）=36 16x+6.7-4x=66.7 x+2x/4=18
人气：309 ℃ 时间：2020-02-15 08:49:27
解答
3（66-3x）=36
66-3x=12
3x=54
x=18
16x+6.7-4x=66.7
12x=60
x=5
x+2x/4=18
x+x/2=18
1.5x=18
x=12
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