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▲
©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[1Q3-20]
(1)
3
7
3
7
27
7
(
＋
)
(2)
3
7
27
7
3
7
(
＋
)
(3)
2
3
2
5
50
3
(
＋
)
(4)
8
3
50
3
1
(
−
)
2
(5)
5
7
20
7
2
5
(
＋
)
(6)
2
5
18
5
3
7
(
＋
)
(7)
50
3
2
3
2
(
−
)
9
(8)
2
3
8
3
2
(
−
)
3
(9)
2
7
18
7
2
7
(
＋
)
(10)
20
7
3
5
125
7
(
＋
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
3
7
3
7
27
7
(
＋
)
3
7
3
7
3
7
=
(
＋
3
)
3
3
=
＋
3
×
7
7
12
=
7
(2)
3
7
27
7
3
7
(
＋
)
3
7
3
7
3
7
=
(
3
＋
)
3
3
=
3
×
＋
7
7
12
=
7
(3)
2
3
2
5
50
3
(
＋
)
2
3
2
5
2
3
=
(
＋
5
)
1
15
2
=
2
＋
5
×
3
2
15
10
=
＋
15
3
(4)
8
3
50
3
1
(
−
)
2
2
3
2
3
1
=
2
(
5
−
)
2
2
2
3
=
10
×
−
3
20
1
6
=
−
3
3
(5)
5
7
20
7
2
5
(
＋
)
5
7
5
7
2
5
=
(
2
＋
)
5
2
7
=
2
×
＋
7
10
14
=
＋
7
7
(6)
2
5
18
5
3
7
(
＋
)
2
5
2
5
3
7
=
(
3
＋
)
2
6
35
=
3
×
＋
5
6
210
=
＋
5
35
(7)
50
3
2
3
2
(
−
)
9
2
3
2
3
2
=
5
(
−
)
9
2
10
2
3
=
5
×
−
3
9
10
10
6
=
−
3
27
(8)
2
3
8
3
2
(
−
)
3
2
3
2
3
2
=
(
2
−
)
3
2
2
2
3
=
2
×
−
3
3
4
2
6
=
−
3
9
(9)
2
7
18
7
2
7
(
＋
)
2
7
2
7
2
7
=
(
3
＋
)
2
2
=
3
×
＋
7
7
8
=
7
(10)
20
7
3
5
125
7
(
＋
)
5
7
3
5
5
7
=
2
(
＋
5
)
3
7
5
=
2
＋
10
×
7
2
21
50
=
＋
7
7