[文字サイズの変更]
▼
▲
©2025 数学クラブ http://sugaku.club/
月 日( )
● 加法の交換法則
[05P-00]
(1)
(
−7
)
+
(
+
1
)
=
(
+
1
)
+
(
)
(2)
(
+
8
)
+
(
+
3
)
=
(
+
3
)
+
(
)
(3)
(
+
7
)
+
(
+
5
)
=
(
)
+
(
+
7
)
(4)
(
−8
)
+
(
−10
)
=
(
)
+
(
−8
)
(5)
(
+
1
)
+
(
+
9
)
=
(
)
+
(
+
1
)
(6)
(
+
10
)
+
(
+
8
)
=
(
+
8
)
+
(
)
(7)
(
+
3
)
+
(
−5
)
=
(
)
+
(
+
3
)
(8)
(
−10
)
+
(
−5
)
=
(
)
+
(
−10
)
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−7
(
−7
)
+
(
+
1
)
=
(
+
1
)
+
(
)
(2)
+
8
(
+
8
)
+
(
+
3
)
=
(
+
3
)
+
(
)
(3)
+
5
(
+
7
)
+
(
+
5
)
=
(
)
+
(
+
7
)
(4)
−10
(
−8
)
+
(
−10
)
=
(
)
+
(
−8
)
(5)
+
9
(
+
1
)
+
(
+
9
)
=
(
)
+
(
+
1
)
(6)
+
10
(
+
10
)
+
(
+
8
)
=
(
+
8
)
+
(
)
(7)
−5
(
+
3
)
+
(
−5
)
=
(
)
+
(
+
3
)
(8)
−5
(
−10
)
+
(
−5
)
=
(
)
+
(
−10
)