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数学
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6×(x-20)=3×(x-10) x=30
6×(x-20)=3×(x-10) x=30
人气:279 ℃ 时间:2020-03-29 05:54:36
解答
6x-120=3x-30
6x-3x=120-30
3x=90
x=90÷3
x=30
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