(1)413+(713-513)(2)79-512+518(3)1115-(45-43)(4)213-(16+0.75)(5)3.74+149+2.26+159(6)1514×2110÷34.-数学

题文

(1)
4
13
+(
7
13
-
5
13
)
(2)
7
9
-
5
12
+
5
18
(3)
11
15
-(
4
5
-
4
3
)
(4)2
1
3
-(
1
6
+0.75)
(5)3.74+1
4
9
+2.26+1
5
9
(6)
15
14
×
21
10
÷
3
4
题型:解答题  难度:中档

答案

(1)
4
13
+(
7
13
-
5
13
)
=
4
13
+
2
13

=
6
13


(2)
7
9
-
5
12
+
5
18

=
28
36
-
15
36
+
10
36

=