计算:(1)a2a+2-4a+2(2)(2x-3x-1)÷x2-9x(3)8+12-33(4)(5-2)2-(5+2)(5-2)+15+2.-数学

题目简介

计算:(1)a2a+2-4a+2(2)(2x-3x-1)÷x2-9x(3)8+12-33(4)(5-2)2-(5+2)(5-2)+15+2.-数学

题目详情

计算:
(1)
a2
a+2
-
4
a+2

(2)(
2x-3
x
-1)÷
x2-9
x

(3)
8
+
1
2
-
3
3

(4)(
5
-2)2-(
5
+2)(
5
-2)+
1
5
+2
题型:解答题难度:中档来源:不详

答案

(1)原式=
a2-4
a+2
=
(a+2)(a-2)
a+2
=a-2;

(2)原式=class="stub"2x-3-x
x
÷
x2-9
x

=class="stub"x-3
x
×class="stub"x
(x+3)(x-3)

=class="stub"1
x+3


(3)原式=2
2
+
2
2
-
3
=class="stub"5
2
2
-
3


(4)原式=5-4
5
+4-(5-4)+
5
-2
=9-4
5
-1+
5
-2
=6-3
5

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