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数学
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先化简,再求值:(-x
2
+5-4x
3
)-2(-x
3
+5x-4),其中x=-2.
人气:492 ℃ 时间:2019-10-19 16:07:53
解答
原式=-x
2
+5-4x
3
+2x
3
-10x+8
=-2x
3
-x
2
-10x+13,
当x=-2时,原式=45.
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