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©2025 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)
57
×
63
(3)
98
×
102
(4)
2
52
(5)
98
×
102
(6)
63
×
57
(7)
2
73
(8)
103
×
97
(9)
2
22
(10)
2
41
(11)
2
71
(12)
2
89
©2025 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)
57
×
63
2
2
=
(
60
−
3
)
(
60
+
3
)
=
60
−
3
=
3600
−
9
=
3591
(3)
98
×
102
2
2
=
(
100
−
2
)
(
100
+
2
)
=
100
−
2
=
10000
−
4
=
9996
(4)
2
52
2
2
2
=
(
50
+
2
)
=
50
+
2
×
50
×
2
+
2
=
2500
+
200
+
4
=
2704
(5)
98
×
102
2
2
=
(
100
−
2
)
(
100
+
2
)
=
100
−
2
=
10000
−
4
=
9996
(6)
63
×
57
2
2
=
(
60
+
3
)
(
60
−
3
)
=
60
−
3
=
3600
−
9
=
3591
(7)
2
73
2
2
2
=
(
70
+
3
)
=
70
+
2
×
70
×
3
+
3
=
4900
+
420
+
9
=
5329
(8)
103
×
97
2
2
=
(
100
+
3
)
(
100
−
3
)
=
100
−
3
=
10000
−
9
=
9991
(9)
2
22
2
2
2
=
(
20
+
2
)
=
20
+
2
×
20
×
2
+
2
=
400
+
80
+
4
=
484
(10)
2
41
2
2
2
=
(
40
+
1
)
=
40
+
2
×
40
×
1
+
1
=
1600
+
80
+
1
=
1681
(11)
2
71
2
2
2
=
(
70
+
1
)
=
70
+
2
×
70
×
1
+
1
=
4900
+
140
+
1
=
5041
(12)
2
89
2
2
2
=
(
90
−
1
)
=
90
−
2
×
90
×
1
+
1
=
8100
−
180
+
1
=
7921