先化简X的平方减1分之3X加3 减 X减1分之2 然后选择一个合适的你最喜欢的X值,带入求值
先化简X的平方减1分之3X加3 减 X减1分之2 然后选择一个合适的你最喜欢的X值,带入求值
其他人气：576 ℃时间：2019-11-21 23:23:15
优质解答
当x=1时,1-4+1=-2有没有过程当x=1时，化简得到的结果是x的平方-4x+1,代入1得-2
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