计算题:(1)(3)2-16+3-8+(-2)2(2)|2-3|-|2-3|-|3-1|(3)(x+1)(x-5)+4(x-1)(4)(a+b-c)(a-b+c)-数学

题目简介

计算题:(1)(3)2-16+3-8+(-2)2(2)|2-3|-|2-3|-|3-1|(3)(x+1)(x-5)+4(x-1)(4)(a+b-c)(a-b+c)-数学

题目详情

计算题:
(1)(
3
)2-
16
+
3-8
+
(-2)2

(2)|
2
-
3
|-|2-
3
|-|
3
-1|

(3)(x+1)(x-5)+4(x-1)
(4)(a+b-c)(a-b+c)
题型:解答题难度:中档来源:不详

答案

(1)原式=3-4-2+2
=-1;

(2)原式=
3
-
2
-(2-
3
)-(
3
-1)
=
3
-
2
-2+
3
-
3
+1
=
3
-
2

-1;

(3)原式=x2-5x+x-5+4x-4
=x2-9;

(4)原式=[a+(b-c)][a-(b-c)]
=a2-(b-c)2
=a2-(b2-2bc+c2)
=a2-b2+2bc-c2.

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