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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
67
(2)
72
×
68
(3)
98
×
102
(4)
61
×
59
(5)
2
59
(6)
2
58
(7)
67
×
73
(8)
19
×
21
(9)
73
×
67
(10)
53
×
47
(11)
2
29
(12)
2
48
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
67
2
2
2
=
(
70
−
3
)
=
70
−
2
×
70
×
3
+
3
=
4900
−
420
+
9
=
4489
(2)
72
×
68
2
2
=
(
70
+
2
)
(
70
−
2
)
=
70
−
2
=
4900
−
4
=
4896
(3)
98
×
102
2
2
=
(
100
−
2
)
(
100
+
2
)
=
100
−
2
=
10000
−
4
=
9996
(4)
61
×
59
2
2
=
(
60
+
1
)
(
60
−
1
)
=
60
−
1
=
3600
−
1
=
3599
(5)
2
59
2
2
2
=
(
60
−
1
)
=
60
−
2
×
60
×
1
+
1
=
3600
−
120
+
1
=
3481
(6)
2
58
2
2
2
=
(
60
−
2
)
=
60
−
2
×
60
×
2
+
2
=
3600
−
240
+
4
=
3364
(7)
67
×
73
2
2
=
(
70
−
3
)
(
70
+
3
)
=
70
−
3
=
4900
−
9
=
4891
(8)
19
×
21
2
2
=
(
20
−
1
)
(
20
+
1
)
=
20
−
1
=
400
−
1
=
399
(9)
73
×
67
2
2
=
(
70
+
3
)
(
70
−
3
)
=
70
−
3
=
4900
−
9
=
4891
(10)
53
×
47
2
2
=
(
50
+
3
)
(
50
−
3
)
=
50
−
3
=
2500
−
9
=
2491
(11)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(12)
2
48
2
2
2
=
(
50
−
2
)
=
50
−
2
×
50
×
2
+
2
=
2500
−
200
+
4
=
2304