(2x³-xyz)-2(x³-y³+xyz)+(xyz-2y³)
= 2x³-xyz-2x³+2y³-2xyz+xyz-2y³
=--2xyz
=12
化简求值:(2x³-xyz)-2(x³-y³+xyz)+(xyz-2y³),x=1,y=2,z=-3
化简求值:(2x³-xyz)-2(x³-y³+xyz)+(xyz-2y³),x=1,y=2,z=-3
数学人气:930 ℃时间:2020-03-26 12:00:21
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