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©2024 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C1-00]
(1)
43
×
37
(2)
92
×
88
(3)
2
53
(4)
2
72
(5)
2
82
(6)
2
81
(7)
28
×
32
(8)
2
81
(9)
2
47
(10)
48
×
52
(11)
47
×
53
(12)
2
33
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
43
×
37
2
2
=
(
40
+
3
)
(
40
−
3
)
=
40
−
3
=
1600
−
9
=
1591
(2)
92
×
88
2
2
=
(
90
+
2
)
(
90
−
2
)
=
90
−
2
=
8100
−
4
=
8096
(3)
2
53
2
2
2
=
(
50
+
3
)
=
50
+
2
×
50
×
3
+
3
=
2500
+
300
+
9
=
2809
(4)
2
72
2
2
2
=
(
70
+
2
)
=
70
+
2
×
70
×
2
+
2
=
4900
+
280
+
4
=
5184
(5)
2
82
2
2
2
=
(
80
+
2
)
=
80
+
2
×
80
×
2
+
2
=
6400
+
320
+
4
=
6724
(6)
2
81
2
2
2
=
(
80
+
1
)
=
80
+
2
×
80
×
1
+
1
=
6400
+
160
+
1
=
6561
(7)
28
×
32
2
2
=
(
30
−
2
)
(
30
+
2
)
=
30
−
2
=
900
−
4
=
896
(8)
2
81
2
2
2
=
(
80
+
1
)
=
80
+
2
×
80
×
1
+
1
=
6400
+
160
+
1
=
6561
(9)
2
47
2
2
2
=
(
50
−
3
)
=
50
−
2
×
50
×
3
+
3
=
2500
−
300
+
9
=
2209
(10)
48
×
52
2
2
=
(
50
−
2
)
(
50
+
2
)
=
50
−
2
=
2500
−
4
=
2496
(11)
47
×
53
2
2
=
(
50
−
3
)
(
50
+
3
)
=
50
−
3
=
2500
−
9
=
2491
(12)
2
33
2
2
2
=
(
30
+
3
)
=
30
+
2
×
30
×
3
+
3
=
900
+
180
+
9
=
1089