题目内容

(15+
5
9
3
5
3
7
×8+
3
7
×8
5
6
×11+
5
6
42×(
1
6
+
1
7
)
24×(
5
6
-
7
12
)
5
9
×
2
3
×
9
10
(1)(15+
5
9
)×
3
5

=15×
3
5
+
5
9
×
3
5

=9+
1
3

=9
1
3


(2)
3
7
×
8+
3
7
×8
=
3
7
×
(7+1)×2
=(
3
7
×
7+
3
7
×1)×2
=3×2+
3
7
×
2
=6+
6
7

=6
6
7


(3)
5
6
×11+
5
6

=
5
6
×(11+1)
=
5
6
×
12
=10;

(4)42×(
1
6
+
1
7

=42×
1
6
+
1
7
×42
=7+6
=13;

(5)24×(
5
6
-
7
12

=24×
5
6
-
7
12
×24
=20-14
=6;

(6)
5
9
×
2
3
×
9
10

=
5
9
×
9
10
×
2
3

=
1
2
×
2
3

=
1
3
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