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数学
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5x-(20-x)×2=86+4x
人气:406 ℃ 时间:2020-04-26 06:42:17
解答
5x-(20-x)×2=86+4x
5x-(40-2x)=86+4x
5x-40+2x=86+4x
7x-4x=86+40
3x=126
x=42
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