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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[1Q3-20]
(1)
18
5
98
5
1
(
＋
)
2
(2)
20
7
5
7
5
7
(
＋
)
(3)
125
7
1
45
7
(
−
＋
)
2
(4)
2
3
8
3
3
(
＋
)
7
(5)
3
7
27
7
1
(
＋
)
2
(6)
50
7
8
7
(
−1
＋
)
(7)
2
7
18
7
(
1
＋
)
(8)
20
7
5
7
2
3
(
＋
)
(9)
125
7
5
7
45
7
(
＋
)
(10)
3
5
27
5
2
(
−
)
5
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
18
5
98
5
1
(
＋
)
2
2
5
2
5
1
=
3
(
7
＋
)
2
2
3
2
5
=
21
×
＋
5
2
42
3
10
=
＋
5
10
(2)
20
7
5
7
5
7
(
＋
)
5
7
5
7
5
7
=
2
(
＋
)
5
5
=
2
×
＋
2
×
7
7
20
=
7
(3)
125
7
1
45
7
(
−
＋
)
2
5
7
1
5
7
=
5
(
−
＋
3
)
2
5
5
7
5
=
−
＋
15
×
2
7
5
35
75
=
−
＋
14
7
(4)
2
3
8
3
3
(
＋
)
7
2
3
2
3
3
=
(
2
＋
)
7
2
3
2
3
=
2
×
＋
3
7
4
1
6
=
＋
3
7
(5)
3
7
27
7
1
(
＋
)
2
3
7
3
7
1
=
(
3
＋
)
2
3
1
3
7
=
3
×
＋
7
2
9
1
21
=
＋
7
14
(6)
50
7
8
7
(
−1
＋
)
2
7
2
7
=
5
(
−1
＋
2
)
2
7
2
=
−5
＋
10
×
7
5
14
20
=
−
＋
7
7
(7)
2
7
18
7
(
1
＋
)
2
7
2
7
=
(
1
＋
3
)
2
7
2
=
＋
3
×
7
1
14
6
=
＋
7
7
(8)
20
7
5
7
2
3
(
＋
)
5
7
5
7
2
3
=
2
(
＋
)
5
10
21
=
2
×
＋
2
7
10
2
210
=
＋
7
21
(9)
125
7
5
7
45
7
(
＋
)
5
7
5
7
5
7
=
5
(
＋
3
)
5
5
=
5
×
＋
15
×
7
7
100
=
7
(10)
3
5
27
5
2
(
−
)
5
3
5
3
5
2
=
(
3
−
)
5
3
2
3
5
=
3
×
−
5
5
9
2
15
=
−
5
25