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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
62
(2)
2
52
(3)
2
47
(4)
91
×
89
(5)
52
×
48
(6)
93
×
87
(7)
87
×
93
(8)
19
×
21
(9)
103
×
97
(10)
103
×
97
(11)
79
×
81
(12)
82
×
78
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
62
2
2
2
=
(
60
+
2
)
=
60
+
2
×
60
×
2
+
2
=
3600
+
240
+
4
=
3844
(2)
2
52
2
2
2
=
(
50
+
2
)
=
50
+
2
×
50
×
2
+
2
=
2500
+
200
+
4
=
2704
(3)
2
47
2
2
2
=
(
50
−
3
)
=
50
−
2
×
50
×
3
+
3
=
2500
−
300
+
9
=
2209
(4)
91
×
89
2
2
=
(
90
+
1
)
(
90
−
1
)
=
90
−
1
=
8100
−
1
=
8099
(5)
52
×
48
2
2
=
(
50
+
2
)
(
50
−
2
)
=
50
−
2
=
2500
−
4
=
2496
(6)
93
×
87
2
2
=
(
90
+
3
)
(
90
−
3
)
=
90
−
3
=
8100
−
9
=
8091
(7)
87
×
93
2
2
=
(
90
−
3
)
(
90
+
3
)
=
90
−
3
=
8100
−
9
=
8091
(8)
19
×
21
2
2
=
(
20
−
1
)
(
20
+
1
)
=
20
−
1
=
400
−
1
=
399
(9)
103
×
97
2
2
=
(
100
+
3
)
(
100
−
3
)
=
100
−
3
=
10000
−
9
=
9991
(10)
103
×
97
2
2
=
(
100
+
3
)
(
100
−
3
)
=
100
−
3
=
10000
−
9
=
9991
(11)
79
×
81
2
2
=
(
80
−
1
)
(
80
+
1
)
=
80
−
1
=
6400
−
1
=
6399
(12)
82
×
78
2
2
=
(
80
+
2
)
(
80
−
2
)
=
80
−
2
=
6400
−
4
=
6396