计算下面各题,能简算的要简算.12+15-14=43-18+712=29+45+79+15=23-56+13=2-27-57=58-(58-12)=-数学

题目简介

计算下面各题,能简算的要简算.12+15-14=43-18+712=29+45+79+15=23-56+13=2-27-57=58-(58-12)=-数学

题目详情

计算下面各题,能简算的要简算.
1
2
+
1
5
-
1
4
=
4
3
-
1
8
+
7
12
=
2
9
+
4
5
+
7
9
+
1
5
=
2
3
-
5
6
+
1
3
=
2-
2
7
-
5
7
=
5
8
-(
5
8
-
1
2
)
=
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
2
+class="stub"1
5
-class="stub"1
4

=class="stub"3
10
-class="stub"1
4

=class="stub"1
20


(2)class="stub"4
3
-class="stub"1
8
+class="stub"7
12

=class="stub"29
24
+class="stub"7
12

=class="stub"43
24


(3)class="stub"2
9
+class="stub"4
5
+class="stub"7
9
+class="stub"1
5

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

(4)class="stub"2
3
-class="stub"5
6
+class="stub"1
3

=class="stub"2
3
+class="stub"1
3
-class="stub"5
6

=1-class="stub"5
6

=class="stub"1
6


(5)2-class="stub"2
7
-class="stub"5
7

=2-(class="stub"2
7
+class="stub"5
7
),
=2-1,
=1;

(6)class="stub"5
8
-(class="stub"5
8
-class="stub"1
2
)

=class="stub"5
8
-class="stub"5
8
+class="stub"1
2

=0+class="stub"1
2

=class="stub"1
2

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