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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
(
8
＋
)
(2)
12
3
5
(
＋
)
(3)
3
75
(
＋
10
)
(4)
3
27
5
(
＋
)
(5)
45
45
(
−9
＋
)
(6)
125
5
5
(
＋
)
(7)
7
7
(
＋
3
)
(8)
63
7
7
(
＋
)
(9)
5
5
2
(
＋
)
(10)
3
3
(
−8
＋
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
3
12
(
8
＋
)
3
3
=
(
8
＋
2
)
3
=
8
＋
2
×
3
3
=
8
＋
6
(2)
12
3
5
(
＋
)
3
3
5
=
2
(
＋
)
15
=
2
×
3
＋
2
15
=
6
＋
2
(3)
3
75
(
＋
10
)
3
3
=
(
5
＋
10
)
3
=
5
×
3
＋
10
3
=
15
＋
10
(4)
3
27
5
(
＋
)
3
3
5
=
(
3
＋
)
15
=
3
×
3
＋
15
=
9
＋
(5)
45
45
(
−9
＋
)
5
5
=
3
(
−9
＋
3
)
5
=
−27
＋
9
×
5
5
=
−27
＋
45
(6)
125
5
5
(
＋
)
5
5
5
=
5
(
＋
)
=
5
×
5
＋
5
×
5
=
50
(7)
7
7
(
＋
3
)
7
=
7
＋
3
7
=
7
＋
3
(8)
63
7
7
(
＋
)
7
7
7
=
3
(
＋
)
=
3
×
7
＋
3
×
7
=
42
(9)
5
5
2
(
＋
)
10
=
5
＋
10
=
5
＋
(10)
3
3
(
−8
＋
)
3
=
−8
＋
3
3
=
−8
＋
3