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计算29+12÷45+38 18÷( 1-12-14) 815÷9+19×715 [4-( 34-38)]×429.

编辑:chaxungu时间:2026-04-27 14:17:35分类:小学数学题库

计算
2
9
+
1
2
÷
4
5
+
3
8
1
8
÷(1-
1
2
-
1
4
8
15
÷9+
1
9
×
7
15
[4-(
3
4
-
3
8
)]×
4
29
(1)
2
9
+
1
2
÷
4
5
+
3
8

=
2
9
+
5
8
+
3
8

=
2
9
+(
5
8
+
3
8
),
=
2
9
+1,
=1
2
9


(2)
1
8
÷(1-
1
2
-
1
4
),
=
1
8
÷(
1
2
-
1
4
),
=
1
8
÷
1
4

=
1
2


(3)
8
15
÷9+
1
9
×
7
15

=
8
15
×
1
9
+
1
9
×
7
15

=(
8
15
+
7
15
)×
1
9

=1×
1
9

=
1
9


(4)[4-(
3
4
-
3
8
)]×
4
29

=[4-
3
8
4
29

=
29
8
×
4
29

=
1
2