原式=2x-2y-3x+6y+5
=-x+4y+5,
当x=2004,y=-0.25时,原式=-2004-1+5=-2000.
化简求值:2(x-y)-3(x-2y)+5;其中x=2004,y=-0.25.
化简求值:2(x-y)-3(x-2y)+5;其中x=2004,y=-0.25.
其他人气:967 ℃时间:2019-10-11 16:37:53
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