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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
68
(2)
2
78
(3)
73
×
67
(4)
82
×
78
(5)
59
×
61
(6)
31
×
29
(7)
49
×
51
(8)
2
52
(9)
2
28
(10)
2
67
(11)
53
×
47
(12)
57
×
63
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
68
2
2
2
=
(
70
−
2
)
=
70
−
2
×
70
×
2
+
2
=
4900
−
280
+
4
=
4624
(2)
2
78
2
2
2
=
(
80
−
2
)
=
80
−
2
×
80
×
2
+
2
=
6400
−
320
+
4
=
6084
(3)
73
×
67
2
2
=
(
70
+
3
)
(
70
−
3
)
=
70
−
3
=
4900
−
9
=
4891
(4)
82
×
78
2
2
=
(
80
+
2
)
(
80
−
2
)
=
80
−
2
=
6400
−
4
=
6396
(5)
59
×
61
2
2
=
(
60
−
1
)
(
60
+
1
)
=
60
−
1
=
3600
−
1
=
3599
(6)
31
×
29
2
2
=
(
30
+
1
)
(
30
−
1
)
=
30
−
1
=
900
−
1
=
899
(7)
49
×
51
2
2
=
(
50
−
1
)
(
50
+
1
)
=
50
−
1
=
2500
−
1
=
2499
(8)
2
52
2
2
2
=
(
50
+
2
)
=
50
+
2
×
50
×
2
+
2
=
2500
+
200
+
4
=
2704
(9)
2
28
2
2
2
=
(
30
−
2
)
=
30
−
2
×
30
×
2
+
2
=
900
−
120
+
4
=
784
(10)
2
67
2
2
2
=
(
70
−
3
)
=
70
−
2
×
70
×
3
+
3
=
4900
−
420
+
9
=
4489
(11)
53
×
47
2
2
=
(
50
+
3
)
(
50
−
3
)
=
50
−
3
=
2500
−
9
=
2491
(12)
57
×
63
2
2
=
(
60
−
3
)
(
60
+
3
)
=
60
−
3
=
3600
−
9
=
3591