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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
69
(2)
2
33
(3)
2
57
(4)
2
73
(5)
73
×
67
(6)
73
×
67
(7)
2
22
(8)
69
×
71
(9)
2
81
(10)
52
×
48
(11)
2
83
(12)
2
33
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
69
2
2
2
=
(
70
−
1
)
=
70
−
2
×
70
×
1
+
1
=
4900
−
140
+
1
=
4761
(2)
2
33
2
2
2
=
(
30
+
3
)
=
30
+
2
×
30
×
3
+
3
=
900
+
180
+
9
=
1089
(3)
2
57
2
2
2
=
(
60
−
3
)
=
60
−
2
×
60
×
3
+
3
=
3600
−
360
+
9
=
3249
(4)
2
73
2
2
2
=
(
70
+
3
)
=
70
+
2
×
70
×
3
+
3
=
4900
+
420
+
9
=
5329
(5)
73
×
67
2
2
=
(
70
+
3
)
(
70
−
3
)
=
70
−
3
=
4900
−
9
=
4891
(6)
73
×
67
2
2
=
(
70
+
3
)
(
70
−
3
)
=
70
−
3
=
4900
−
9
=
4891
(7)
2
22
2
2
2
=
(
20
+
2
)
=
20
+
2
×
20
×
2
+
2
=
400
+
80
+
4
=
484
(8)
69
×
71
2
2
=
(
70
−
1
)
(
70
+
1
)
=
70
−
1
=
4900
−
1
=
4899
(9)
2
81
2
2
2
=
(
80
+
1
)
=
80
+
2
×
80
×
1
+
1
=
6400
+
160
+
1
=
6561
(10)
52
×
48
2
2
=
(
50
+
2
)
(
50
−
2
)
=
50
−
2
=
2500
−
4
=
2496
(11)
2
83
2
2
2
=
(
80
+
3
)
=
80
+
2
×
80
×
3
+
3
=
6400
+
480
+
9
=
6889
(12)
2
33
2
2
2
=
(
30
+
3
)
=
30
+
2
×
30
×
3
+
3
=
900
+
180
+
9
=
1089