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