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©2026 数学クラブ http://sugaku.club/
月 日( )
● 分配法則
[3D0-00]
(1)
8
×
(
−8
+
5
)
=
8
×
+
8
×
5
(2)
(
9
+
1
)
×
4
=
9
×
+
1
×
(3)
10
×
(
−5
+
2
)
=
10
×
+
10
×
2
(4)
(
−10
+
6
)
×
7
=
−10
×
7
+
×
7
(5)
9
×
{
6
+
(
−2
)
}
=
×
6
+
×
(
−2
)
(6)
−8
×
(
−6
+
5
)
=
×
(
−6
)
+
×
5
(7)
5
×
(
−7
+
4
)
=
5
×
+
5
×
4
(8)
(
7
+
6
)
×
2
=
7
×
+
6
×
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
−8
)
8
×
(
−8
+
5
)
=
8
×
+
8
×
5
(2)
4
4
(
9
+
1
)
×
4
=
9
×
+
1
×
(3)
(
−5
)
10
×
(
−5
+
2
)
=
10
×
+
10
×
2
(4)
6
(
−10
+
6
)
×
7
=
−10
×
7
+
×
7
(5)
9
9
9
×
{
6
+
(
−2
)
}
=
×
6
+
×
(
−2
)
(6)
(
−8
)
(
−8
)
−8
×
(
−6
+
5
)
=
×
(
−6
)
+
×
5
(7)
(
−7
)
5
×
(
−7
+
4
)
=
5
×
+
5
×
4
(8)
2
2
(
7
+
6
)
×
2
=
7
×
+
6
×