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79×91×213 4-67×56 (56+15)×60 78×45+78×15.

编辑:chaxungu时间:2026-04-27 14:17:28分类:小学数学题库

7
9
×91×
2
13
4-
6
7
×
5
6
5
6
+
1
5
)×60
7
8
×
4
5
+
7
8
×
1
5
(1)
7
9
×91×
2
13

=
7
9
×7×2,
=
98
9


(2)4-
6
7
×
5
6

=4-
5
7

=3
2
7


(3)(
5
6
+
1
5
)×60,
=
5
6
×60+
1
5
×60,
=50+12,
=62;

(4)
7
8
×
4
5
+
7
8
×
1
5

=
7
8
×(
4
5
+
1
5
),
=
7
8
×1,
=
7
8