计算:(1)12+20-(5-3)(2)(9a+a1a-2aa3)÷b(3)1+(2+3)2(7-3)(7+3)(4)12+|-3|-(-2006)0+(12)-1.-数学

题目简介

计算:(1)12+20-(5-3)(2)(9a+a1a-2aa3)÷b(3)1+(2+3)2(7-3)(7+3)(4)12+|-3|-(-2006)0+(12)-1.-数学

题目详情

计算:
(1)
12
+
20
-(
5
-
3
)
                
(2)(
9a
+a
1
a
-
2
a
a3
b

(3)
1+(2+
3
)2
(
7
-
3
)(
7
+
3
)
              
(4)
12
+|-
3
|-(-2006)0+(
1
2
)-1
题型:解答题难度:中档来源:不详

答案

(1)原式=2
3
+2
5
-
5
+
3

=3
3
+
5

(2)原式=(3
a
+
a
-2
a
)÷
b

=2
a
÷
b

=
2
ab
b

(3)原式=
1+4+4
3
+3
7-3

=
8+4
3
4

=2+
3

(4)原式=2
3
+
3
-1+2
=3
3
+1.

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