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