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正面各题.怎样简便就怎样算.145-13-53=23×54÷109=25-25×34 512÷9+712×19.

编辑:chaxungu时间:2026-04-27 14:17:59分类:小学数学题库

正面各题,怎样简便就怎样算.
14
5
-
1
3
-
5
3
=
2
3
×
5
4
÷
10
9
=
25-25×
3
4

5
12
÷9+
7
12
×
1
9
(1)
14
5
-
1
3
-
5
3

=2
4
5
-(
1
3
+
5
3
),
=2
4
5
-2,
=
4
5


(2)
2
3
×
5
4
÷
10
9

=
2
3
×
5
4
×
9
10

=
3
4


(3)25-25×
3
4

=(1-
3
4
)×25,
=
1
4
×25,
=
25
4


(4)
5
12
÷9+
7
12
×
1
9

=
5
12
×
1
9
+
7
12
×
1
9

=(
5
12
+
7
12
)×
1
9

=1×
1
9

=
1
9