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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
88
(2)
62
×
58
(3)
67
×
73
(4)
67
×
73
(5)
71
×
69
(6)
43
×
37
(7)
2
77
(8)
31
×
29
(9)
69
×
71
(10)
2
87
(11)
42
×
38
(12)
78
×
82
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
88
2
2
2
=
(
90
−
2
)
=
90
−
2
×
90
×
2
+
2
=
8100
−
360
+
4
=
7744
(2)
62
×
58
2
2
=
(
60
+
2
)
(
60
−
2
)
=
60
−
2
=
3600
−
4
=
3596
(3)
67
×
73
2
2
=
(
70
−
3
)
(
70
+
3
)
=
70
−
3
=
4900
−
9
=
4891
(4)
67
×
73
2
2
=
(
70
−
3
)
(
70
+
3
)
=
70
−
3
=
4900
−
9
=
4891
(5)
71
×
69
2
2
=
(
70
+
1
)
(
70
−
1
)
=
70
−
1
=
4900
−
1
=
4899
(6)
43
×
37
2
2
=
(
40
+
3
)
(
40
−
3
)
=
40
−
3
=
1600
−
9
=
1591
(7)
2
77
2
2
2
=
(
80
−
3
)
=
80
−
2
×
80
×
3
+
3
=
6400
−
480
+
9
=
5929
(8)
31
×
29
2
2
=
(
30
+
1
)
(
30
−
1
)
=
30
−
1
=
900
−
1
=
899
(9)
69
×
71
2
2
=
(
70
−
1
)
(
70
+
1
)
=
70
−
1
=
4900
−
1
=
4899
(10)
2
87
2
2
2
=
(
90
−
3
)
=
90
−
2
×
90
×
3
+
3
=
8100
−
540
+
9
=
7569
(11)
42
×
38
2
2
=
(
40
+
2
)
(
40
−
2
)
=
40
−
2
=
1600
−
4
=
1596
(12)
78
×
82
2
2
=
(
80
−
2
)
(
80
+
2
)
=
80
−
2
=
6400
−
4
=
6396