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简算34×18+78×34 4-49-59 10.1×9.9 30×(25+16-415) 76÷3+13×13+13.

编辑:chaxungu时间:2026-04-27 13:18:59分类:小学数学题库

简算
3
4
×
1
8
+
7
8
×
3
4

4-
4
9
-
5
9
10.1×9.9
30×(
2
5
+
1
6
-
4
15
)
76÷3+13×
1
3
+
1
3
.
(1)
3
4
×
1
8
+
7
8
×
3
4
,
=
3
4
×(
1
8
+
7
8
),
=
3
4
×1,
=
3
4
;

(2)4-
4
9
-
5
9
,
=4-(
4
9
+
5
9
),
=4-1
=3;

(3)10.1×9.9,
=10×9.9+0.1×9.9,
=99+0.99,
=99.99;

(4)30×(
2
5
+
1
6
-
4
15
),
=30×
2
5
+30×
1
6
-30×
4
15
,
=12+5-8,
=9;

(5)76÷3+13×
1
3
+
1
3
,
=76×
1
3
+13×
1
3
+
1
3
,
=(76+13+1)×
1
3
,
=90×
1
3
,
=30.