题目内容

24×(
5
6
+
5
12
3
5
×12×
5
6
5
8
×99+
5
8
85
86
×87
1
87
×
2
19
×87
5
8
×
1
3
+
2
3
×
5
8
(1)24×(
5
6
+
5
12

=24×
5
6
+24×
5
12

=20+10
=30;

(2)
3
5
×12×
5
6

=
3
5
×
5
6
×12
=
1
2
×12
=6;

(3)
5
8
×99+
5
8

=
5
8
×(99+1)
=
5
8
×100
=62.5;

(4)
85
86
×87
=
85
86
×(86+1)
=
85
86
×86+
85
86
×1
=85
85
86


(5)
1
87
×
2
19
×87
=
1
87
×87×
2
19

=
2
19


(6)
5
8
×
1
3
+
5
8
×
2
3

=
5
8
×(
1
3
+
2
3

=
5
8
×1
=
5
8
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