[文字サイズの変更]
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C1-00]
(1)
92
×
88
(2)
83
×
77
(3)
33
×
27
(4)
92
×
88
(5)
2
29
(6)
103
×
97
(7)
78
×
82
(8)
82
×
78
(9)
87
×
93
(10)
99
×
101
(11)
52
×
48
(12)
32
×
28
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
92
×
88
2
2
=
(
90
+
2
)
(
90
−
2
)
=
90
−
2
=
8100
−
4
=
8096
(2)
83
×
77
2
2
=
(
80
+
3
)
(
80
−
3
)
=
80
−
3
=
6400
−
9
=
6391
(3)
33
×
27
2
2
=
(
30
+
3
)
(
30
−
3
)
=
30
−
3
=
900
−
9
=
891
(4)
92
×
88
2
2
=
(
90
+
2
)
(
90
−
2
)
=
90
−
2
=
8100
−
4
=
8096
(5)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(6)
103
×
97
2
2
=
(
100
+
3
)
(
100
−
3
)
=
100
−
3
=
10000
−
9
=
9991
(7)
78
×
82
2
2
=
(
80
−
2
)
(
80
+
2
)
=
80
−
2
=
6400
−
4
=
6396
(8)
82
×
78
2
2
=
(
80
+
2
)
(
80
−
2
)
=
80
−
2
=
6400
−
4
=
6396
(9)
87
×
93
2
2
=
(
90
−
3
)
(
90
+
3
)
=
90
−
3
=
8100
−
9
=
8091
(10)
99
×
101
2
2
=
(
100
−
1
)
(
100
+
1
)
=
100
−
1
=
10000
−
1
=
9999
(11)
52
×
48
2
2
=
(
50
+
2
)
(
50
−
2
)
=
50
−
2
=
2500
−
4
=
2496
(12)
32
×
28
2
2
=
(
30
+
2
)
(
30
−
2
)
=
30
−
2
=
900
−
4
=
896