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4x-(50-x)x2=20解方程
人气:209 ℃ 时间:2020-02-05 22:21:29
解答
4x-(50-x)x2=20
4x-100+2x=20
6x=120
x=20为什么是减不是加4x-(50-x)x2=204x-(100-2x)=20 去括号要变号的4x-100+2x=206x=120x=20
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