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化简(x-y)+2(y-z)-(x-z)
人气:253 ℃ 时间:2020-07-19 10:30:00
解答
(x-y)+2(y-z)-(x-z)
=x-y+2y-2z-x+z
=(x-x)+(2y-y)-(2z-z)2
=y-z
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