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数学
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1.5X+20=1X（50-X）怎么算?
人气：455 ℃ 时间：2020-01-25 12:58:38
解答
1.5X+20=1×（50-X）
1.5x+20=50-x
1.5x+x=50-20
2.5x=30
x=30÷2.5
x=12
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