[文字サイズの変更]
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C1-00]
(1)
2
37
(2)
49
×
51
(3)
2
71
(4)
102
×
98
(5)
2
51
(6)
2
81
(7)
2
53
(8)
72
×
68
(9)
2
47
(10)
27
×
33
(11)
82
×
78
(12)
38
×
42
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
37
2
2
2
=
(
40
−
3
)
=
40
−
2
×
40
×
3
+
3
=
1600
−
240
+
9
=
1369
(2)
49
×
51
2
2
=
(
50
−
1
)
(
50
+
1
)
=
50
−
1
=
2500
−
1
=
2499
(3)
2
71
2
2
2
=
(
70
+
1
)
=
70
+
2
×
70
×
1
+
1
=
4900
+
140
+
1
=
5041
(4)
102
×
98
2
2
=
(
100
+
2
)
(
100
−
2
)
=
100
−
2
=
10000
−
4
=
9996
(5)
2
51
2
2
2
=
(
50
+
1
)
=
50
+
2
×
50
×
1
+
1
=
2500
+
100
+
1
=
2601
(6)
2
81
2
2
2
=
(
80
+
1
)
=
80
+
2
×
80
×
1
+
1
=
6400
+
160
+
1
=
6561
(7)
2
53
2
2
2
=
(
50
+
3
)
=
50
+
2
×
50
×
3
+
3
=
2500
+
300
+
9
=
2809
(8)
72
×
68
2
2
=
(
70
+
2
)
(
70
−
2
)
=
70
−
2
=
4900
−
4
=
4896
(9)
2
47
2
2
2
=
(
50
−
3
)
=
50
−
2
×
50
×
3
+
3
=
2500
−
300
+
9
=
2209
(10)
27
×
33
2
2
=
(
30
−
3
)
(
30
+
3
)
=
30
−
3
=
900
−
9
=
891
(11)
82
×
78
2
2
=
(
80
+
2
)
(
80
−
2
)
=
80
−
2
=
6400
−
4
=
6396
(12)
38
×
42
2
2
=
(
40
−
2
)
(
40
+
2
)
=
40
−
2
=
1600
−
4
=
1596