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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[1Q3-00]
(1)
12
3
3
(
＋
)
(2)
125
5
(
2
＋
)
(3)
125
5
5
(
＋
)
(4)
7
7
(
−
2
)
(5)
28
7
(
1
＋
)
(6)
7
5
7
(
＋
)
(7)
45
5
5
(
＋
)
(8)
5
3
20
(
＋
)
(9)
45
20
(
−5
＋
)
(10)
2
18
(
＋
8
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
12
3
3
(
＋
)
3
3
3
=
2
(
＋
)
=
2
×
3
＋
2
×
3
=
12
(2)
125
5
(
2
＋
)
5
5
=
5
(
2
＋
)
5
=
10
＋
5
×
5
5
=
10
＋
25
(3)
125
5
5
(
＋
)
5
5
5
=
5
(
＋
)
=
5
×
5
＋
5
×
5
=
50
(4)
7
7
(
−
2
)
7
=
7
−
2
7
=
7
−
2
(5)
28
7
(
1
＋
)
7
7
=
2
(
1
＋
)
7
=
2
＋
2
×
7
7
=
2
＋
14
(6)
7
5
7
(
＋
)
35
=
＋
7
35
=
＋
7
(7)
45
5
5
(
＋
)
5
5
5
=
3
(
＋
)
=
3
×
5
＋
3
×
5
=
30
(8)
5
3
20
(
＋
)
5
3
5
=
(
＋
2
)
15
=
＋
2
×
5
15
=
＋
10
(9)
45
20
(
−5
＋
)
5
5
=
3
(
−5
＋
2
)
5
=
−15
＋
6
×
5
5
=
−15
＋
30
(10)
2
18
(
＋
8
)
2
2
=
(
3
＋
8
)
2
=
3
×
2
＋
8
2
=
6
＋
8