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脱式计算,能简算的要简算,并写出简便过程:45+910+110+2534-(16+215)10-47-3712-14+12-34.

题目详情
脱式计算,能简算的要简算,并写出简便过程:
4
5
+
9
10
+
1
10
+
2
5

3
4
-(
1
6
+
2
15
)               
10-
4
7
-
3
7

1
2
-
1
4
+
1
2
-
3
4
▼优质解答
答案和解析
(1)
4
5
+
9
10
+
1
10
+
2
5

=(
4
5
+
2
5
)+(
9
10
+
1
10

=1
1
5
+1
=2
1
5


(2)
3
4
-(
1
6
+
2
15

=
3
4
-
3
10

=
9
20


(3)10-
4
7
-
3
7

=10-(
4
7
+
3
7

=10-1
=9;

(4)
1
2
-
1
4
+
1
2
-
3
4

=(
1
2
+
1
2
)-(
1
4
+
3
4

=1-1
=0.