计算:(1)(13)-2-(3-1)0+52+1(2)(1a+1b)÷a+bb.-数学

题目简介

计算:(1)(13)-2-(3-1)0+52+1(2)(1a+1b)÷a+bb.-数学

题目详情

计算:
(1)(
1
3
)-2-(
3
-1)0+
5
2
+1

(2)(
1
a
+
1
b
a+b
b
题型:解答题难度:中档来源:昆明

答案

(1)(class="stub"1
3
)-2-(
3
-1)0+class="stub"5
2
+1

=9-1+
5(
2
-1)
(
2
+1)(
2
-1)

=8+5
2
-5
=3+5
2


(2)(class="stub"1
a
+class="stub"1
b
)÷class="stub"a+b
b

=class="stub"a+b
ab
×class="stub"b
a+b

=class="stub"1
a

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