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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
38
(2)
71
×
69
(3)
2
38
(4)
22
×
18
(5)
92
×
88
(6)
87
×
93
(7)
97
×
103
(8)
2
79
(9)
2
27
(10)
2
87
(11)
68
×
72
(12)
61
×
59
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
38
2
2
2
=
(
40
−
2
)
=
40
−
2
×
40
×
2
+
2
=
1600
−
160
+
4
=
1444
(2)
71
×
69
2
2
=
(
70
+
1
)
(
70
−
1
)
=
70
−
1
=
4900
−
1
=
4899
(3)
2
38
2
2
2
=
(
40
−
2
)
=
40
−
2
×
40
×
2
+
2
=
1600
−
160
+
4
=
1444
(4)
22
×
18
2
2
=
(
20
+
2
)
(
20
−
2
)
=
20
−
2
=
400
−
4
=
396
(5)
92
×
88
2
2
=
(
90
+
2
)
(
90
−
2
)
=
90
−
2
=
8100
−
4
=
8096
(6)
87
×
93
2
2
=
(
90
−
3
)
(
90
+
3
)
=
90
−
3
=
8100
−
9
=
8091
(7)
97
×
103
2
2
=
(
100
−
3
)
(
100
+
3
)
=
100
−
3
=
10000
−
9
=
9991
(8)
2
79
2
2
2
=
(
80
−
1
)
=
80
−
2
×
80
×
1
+
1
=
6400
−
160
+
1
=
6241
(9)
2
27
2
2
2
=
(
30
−
3
)
=
30
−
2
×
30
×
3
+
3
=
900
−
180
+
9
=
729
(10)
2
87
2
2
2
=
(
90
−
3
)
=
90
−
2
×
90
×
3
+
3
=
8100
−
540
+
9
=
7569
(11)
68
×
72
2
2
=
(
70
−
2
)
(
70
+
2
)
=
70
−
2
=
4900
−
4
=
4896
(12)
61
×
59
2
2
=
(
60
+
1
)
(
60
−
1
)
=
60
−
1
=
3600
−
1
=
3599