[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
49
(2)
71
×
69
(3)
37
×
43
(4)
31
×
29
(5)
18
×
22
(6)
42
×
38
(7)
2
27
(8)
2
73
(9)
48
×
52
(10)
2
63
(11)
43
×
37
(12)
2
37
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
49
2
2
2
=
(
50
−
1
)
=
50
−
2
×
50
×
1
+
1
=
2500
−
100
+
1
=
2401
(2)
71
×
69
2
2
=
(
70
+
1
)
(
70
−
1
)
=
70
−
1
=
4900
−
1
=
4899
(3)
37
×
43
2
2
=
(
40
−
3
)
(
40
+
3
)
=
40
−
3
=
1600
−
9
=
1591
(4)
31
×
29
2
2
=
(
30
+
1
)
(
30
−
1
)
=
30
−
1
=
900
−
1
=
899
(5)
18
×
22
2
2
=
(
20
−
2
)
(
20
+
2
)
=
20
−
2
=
400
−
4
=
396
(6)
42
×
38
2
2
=
(
40
+
2
)
(
40
−
2
)
=
40
−
2
=
1600
−
4
=
1596
(7)
2
27
2
2
2
=
(
30
−
3
)
=
30
−
2
×
30
×
3
+
3
=
900
−
180
+
9
=
729
(8)
2
73
2
2
2
=
(
70
+
3
)
=
70
+
2
×
70
×
3
+
3
=
4900
+
420
+
9
=
5329
(9)
48
×
52
2
2
=
(
50
−
2
)
(
50
+
2
)
=
50
−
2
=
2500
−
4
=
2496
(10)
2
63
2
2
2
=
(
60
+
3
)
=
60
+
2
×
60
×
3
+
3
=
3600
+
360
+
9
=
3969
(11)
43
×
37
2
2
=
(
40
+
3
)
(
40
−
3
)
=
40
−
3
=
1600
−
9
=
1591
(12)
2
37
2
2
2
=
(
40
−
3
)
=
40
−
2
×
40
×
3
+
3
=
1600
−
240
+
9
=
1369