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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[1Q3-00]
(1)
3
12
2
(
＋
)
(2)
45
5
(
＋
3
)
(3)
7
28
(
−8
＋
)
(4)
8
2
(
＋
10
)
(5)
18
2
(
−
7
)
(6)
18
2
3
(
＋
)
(7)
2
2
(
−
8
)
(8)
28
7
(
6
＋
)
(9)
8
18
2
(
＋
)
(10)
18
7
8
(
＋
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
3
12
2
(
＋
)
3
3
2
=
(
2
＋
)
6
=
2
×
3
＋
6
=
6
＋
(2)
45
5
(
＋
3
)
5
5
=
3
(
＋
3
)
5
=
3
×
5
＋
9
5
=
15
＋
9
(3)
7
28
(
−8
＋
)
7
7
=
(
−8
＋
2
)
7
=
−8
＋
2
×
7
7
=
−8
＋
14
(4)
8
2
(
＋
10
)
2
2
=
2
(
＋
10
)
2
=
2
×
2
＋
20
2
=
4
＋
20
(5)
18
2
(
−
7
)
2
2
=
3
(
−
7
)
2
=
3
×
2
−
21
2
=
6
−
21
(6)
18
2
3
(
＋
)
2
2
3
=
3
(
＋
)
6
=
3
×
2
＋
3
6
=
6
＋
3
(7)
2
2
(
−
8
)
2
=
2
−
8
2
=
2
−
8
(8)
28
7
(
6
＋
)
7
7
=
2
(
6
＋
)
7
=
12
＋
2
×
7
7
=
12
＋
14
(9)
8
18
2
(
＋
)
2
2
2
=
2
(
3
＋
)
=
6
×
2
＋
2
×
2
=
16
(10)
18
7
8
(
＋
)
2
7
2
=
3
(
＋
2
)
14
=
3
＋
6
×
2
14
=
3
＋
12