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递等式计算.49×15÷45 4-511-611 18×58+42÷8 36×(23+16-34)

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

递等式计算.
4
9
×
1
5
÷
4
5
4-
5
11
-
6
11
1
8
×58+42÷8
36×(
2
3
+
1
6
-
3
4
(1)
4
9
×
1
5
÷
4
5

=
4
9
×
1
5
×
5
4

=
1
9


(2)4-
5
11
-
6
11

=4-(
5
11
+
6
11
),
=4-1,
=3;

(3)
1
8
×58+42÷8,
=
1
8
×58+42×
1
8

=(58+42)×
1
8

=100×
1
8

=12.5;

(4)36×(
2
3
+
1
6
-
3
4
),
=36×
2
3
+36×
1
6
-36×
3
4

=24+6-27,
=3.