(x-y)×68×200+﹙z-y﹚×68×100求简化
人气:112 ℃ 时间:2020-02-02 22:12:45
解答
(x-y)×68×200+﹙z-y)×68×100
=(x-y)×2×68×100+﹙z-y)×68×100
=(2x-2y+z-y)×6800
=6800(2x-3y+z)
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