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数学
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化简并求值:3x
3
-[x
3
+(6x
2
-7x)]-2(x
3
-3x
2
-4x)其中x=-1.
人气:168 ℃ 时间:2019-10-11 21:24:40
解答
原式=3x
3
-(x
3
+6x
2
-7x)-2x
3
+6x
2
+8x,
=3x
3
-x
3
-6x
2
+7x-2x
3
+6x
2
+8x,
=15x,
当x=-1时,原式=15x=15×(-1)=-15.
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