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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)
62
×
58
(2)
2
39
(3)
21
×
19
(4)
2
27
(5)
61
×
59
(6)
2
88
(7)
23
×
17
(8)
62
×
58
(9)
2
58
(10)
2
31
(11)
2
88
(12)
102
×
98
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
62
×
58
2
2
=
(
60
+
2
)
(
60
−
2
)
=
60
−
2
=
3600
−
4
=
3596
(2)
2
39
2
2
2
=
(
40
−
1
)
=
40
−
2
×
40
×
1
+
1
=
1600
−
80
+
1
=
1521
(3)
21
×
19
2
2
=
(
20
+
1
)
(
20
−
1
)
=
20
−
1
=
400
−
1
=
399
(4)
2
27
2
2
2
=
(
30
−
3
)
=
30
−
2
×
30
×
3
+
3
=
900
−
180
+
9
=
729
(5)
61
×
59
2
2
=
(
60
+
1
)
(
60
−
1
)
=
60
−
1
=
3600
−
1
=
3599
(6)
2
88
2
2
2
=
(
90
−
2
)
=
90
−
2
×
90
×
2
+
2
=
8100
−
360
+
4
=
7744
(7)
23
×
17
2
2
=
(
20
+
3
)
(
20
−
3
)
=
20
−
3
=
400
−
9
=
391
(8)
62
×
58
2
2
=
(
60
+
2
)
(
60
−
2
)
=
60
−
2
=
3600
−
4
=
3596
(9)
2
58
2
2
2
=
(
60
−
2
)
=
60
−
2
×
60
×
2
+
2
=
3600
−
240
+
4
=
3364
(10)
2
31
2
2
2
=
(
30
+
1
)
=
30
+
2
×
30
×
1
+
1
=
900
+
60
+
1
=
961
(11)
2
88
2
2
2
=
(
90
−
2
)
=
90
−
2
×
90
×
2
+
2
=
8100
−
360
+
4
=
7744
(12)
102
×
98
2
2
=
(
100
+
2
)
(
100
−
2
)
=
100
−
2
=
10000
−
4
=
9996