>
数学
>
先化简,再求值:(x+2)
2
+(2x+1)(2x-1)-4x(x+1),其中x=-
2
.
人气:150 ℃ 时间:2020-03-23 11:36:31
解答
原式=x
2
+4x+4+4x
2
-1-4x
2
-4x=x
2
+3,
当x=-
2
时,原式=2+3=5.
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