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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C1-00]
(1)
2
72
(2)
2
29
(3)
2
57
(4)
2
48
(5)
2
87
(6)
2
59
(7)
2
82
(8)
2
22
(9)
2
32
(10)
38
×
42
(11)
2
83
(12)
2
32
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
72
2
2
2
=
(
70
+
2
)
=
70
+
2
×
70
×
2
+
2
=
4900
+
280
+
4
=
5184
(2)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(3)
2
57
2
2
2
=
(
60
−
3
)
=
60
−
2
×
60
×
3
+
3
=
3600
−
360
+
9
=
3249
(4)
2
48
2
2
2
=
(
50
−
2
)
=
50
−
2
×
50
×
2
+
2
=
2500
−
200
+
4
=
2304
(5)
2
87
2
2
2
=
(
90
−
3
)
=
90
−
2
×
90
×
3
+
3
=
8100
−
540
+
9
=
7569
(6)
2
59
2
2
2
=
(
60
−
1
)
=
60
−
2
×
60
×
1
+
1
=
3600
−
120
+
1
=
3481
(7)
2
82
2
2
2
=
(
80
+
2
)
=
80
+
2
×
80
×
2
+
2
=
6400
+
320
+
4
=
6724
(8)
2
22
2
2
2
=
(
20
+
2
)
=
20
+
2
×
20
×
2
+
2
=
400
+
80
+
4
=
484
(9)
2
32
2
2
2
=
(
30
+
2
)
=
30
+
2
×
30
×
2
+
2
=
900
+
120
+
4
=
1024
(10)
38
×
42
2
2
=
(
40
−
2
)
(
40
+
2
)
=
40
−
2
=
1600
−
4
=
1596
(11)
2
83
2
2
2
=
(
80
+
3
)
=
80
+
2
×
80
×
3
+
3
=
6400
+
480
+
9
=
6889
(12)
2
32
2
2
2
=
(
30
+
2
)
=
30
+
2
×
30
×
2
+
2
=
900
+
120
+
4
=
1024