简算23+(712-16)139-23-1359+712+512+49.-数学

题目简介

简算23+(712-16)139-23-1359+712+512+49.-数学

题目详情

简算
2
3
+(
7
12
-
1
6
)

13
9
-
2
3
-
1
3

5
9
+
7
12
+
5
12
+
4
9
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
3
+(class="stub"7
12
-class="stub"1
6
),
=class="stub"8
12
+(class="stub"7
12
-class="stub"2
12
),
=class="stub"8
12
+class="stub"5
12

=1class="stub"1
12


(2)class="stub"13
9
-class="stub"2
3
-class="stub"1
3

=class="stub"13
9
-(class="stub"2
3
+class="stub"1
3
),
=class="stub"13
9
-1,
=class="stub"4
9


(3)class="stub"5
9
+class="stub"7
12
+class="stub"5
12
+class="stub"4
9

=(class="stub"5
9
+class="stub"4
9
)+(class="stub"7
12
+class="stub"5
12
),
=1+1,
=2.

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