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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
53
(2)
81
×
79
(3)
2
83
(4)
83
×
77
(5)
23
×
17
(6)
48
×
52
(7)
32
×
28
(8)
2
42
(9)
22
×
18
(10)
2
62
(11)
32
×
28
(12)
2
27
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
53
2
2
2
=
(
50
+
3
)
=
50
+
2
×
50
×
3
+
3
=
2500
+
300
+
9
=
2809
(2)
81
×
79
2
2
=
(
80
+
1
)
(
80
−
1
)
=
80
−
1
=
6400
−
1
=
6399
(3)
2
83
2
2
2
=
(
80
+
3
)
=
80
+
2
×
80
×
3
+
3
=
6400
+
480
+
9
=
6889
(4)
83
×
77
2
2
=
(
80
+
3
)
(
80
−
3
)
=
80
−
3
=
6400
−
9
=
6391
(5)
23
×
17
2
2
=
(
20
+
3
)
(
20
−
3
)
=
20
−
3
=
400
−
9
=
391
(6)
48
×
52
2
2
=
(
50
−
2
)
(
50
+
2
)
=
50
−
2
=
2500
−
4
=
2496
(7)
32
×
28
2
2
=
(
30
+
2
)
(
30
−
2
)
=
30
−
2
=
900
−
4
=
896
(8)
2
42
2
2
2
=
(
40
+
2
)
=
40
+
2
×
40
×
2
+
2
=
1600
+
160
+
4
=
1764
(9)
22
×
18
2
2
=
(
20
+
2
)
(
20
−
2
)
=
20
−
2
=
400
−
4
=
396
(10)
2
62
2
2
2
=
(
60
+
2
)
=
60
+
2
×
60
×
2
+
2
=
3600
+
240
+
4
=
3844
(11)
32
×
28
2
2
=
(
30
+
2
)
(
30
−
2
)
=
30
−
2
=
900
−
4
=
896
(12)
2
27
2
2
2
=
(
30
−
3
)
=
30
−
2
×
30
×
3
+
3
=
900
−
180
+
9
=
729