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> 求值:(1)化简后求值:(1-3a)2-2(1-3a),其中a=-1.(2)化简:(-1)2010-|-7|+9×(5-π)0+(15)-1.-数学
求值:(1)化简后求值:(1-3a)2-2(1-3a),其中a=-1.(2)化简:(-1)2010-|-7|+9×(5-π)0+(15)-1.-数学
题目简介
求值:(1)化简后求值:(1-3a)2-2(1-3a),其中a=-1.(2)化简:(-1)2010-|-7|+9×(5-π)0+(15)-1.-数学
题目详情
求值:(1)化简后求值:(1-3a)
2
-2(1-3a),其中a=-1.
(2)化简:
(-1
)
2010
-|-7|+
9
×(
5
-π
)
0
+(
1
5
)
-1
.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=1-6a+9a2-2+6a
=9a2-1
∴当a=-1,
原式=9×(-1)2-1
=8.
(2)原式=-1-7+3×1+5
=0
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题目简介
求值:(1)化简后求值:(1-3a)2-2(1-3a),其中a=-1.(2)化简:(-1)2010-|-7|+9×(5-π)0+(15)-1.-数学
题目详情
(2)化简:(-1)2010-|-7|+
答案
=9a2-1
∴当a=-1,
原式=9×(-1)2-1
=8.
(2)原式=-1-7+3×1+5
=0