计算下列各题,能简算的要简算. (1) 4 5 +( 3 8 - 1 4 ) (2)2- 3 7 - 4 7 (3) 5

计算下列各题,能简算的要简算.
(1)
4
5
+(
3
8
-
1
4
(2)2-
3
7
-
4
7
(3)
5
8
-
1
3
+
5
12
(4)
2
9
+
9
17
+
7
9
+
8
17
(5)
5
12
-(
1
2
-
1
12
(6)
4
5
-(
7
15
-
4
9
xijilz 1年前 已收到1个回答 举报

bxh2536 幼苗

共回答了17个问题采纳率:94.1% 举报

(1)
4
5 +(
3
8 -
1
4 ),
=
4
5 +
1
8 ,
=
37
40 ;

(2)2-
3
7 -
4
7 ,
=2-(
3
7 +
4
7 ),
=2-1,
=1;

(3)
5
8 -
1
3 +
5
12 ,
=
7
24 +
5
12 ,
=
17
24 ;

(4)
2
9 +
9
17 +
7
9 +
8
17 ,
=(
2
9 +
7
9 )+(
9
17 +
8
17 ),
=1+1,
=2;

(5)
5
12 -(
1
2 -
1
12 ),
=
5
12 -
1
2 +
1
12 ,
=
5
12 +
1
12 -
1
2 ,
=
1
2 -
1
2 ,
=0;

(6)
4
5 -(
7
15 -
4
9 ),
=
4
5 -
7
15 +
4
9 ,
=
1
3 +
4
9 ,
=
7
9 .

1年前

2
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