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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C0-10]
(1)
2
2
2.1
−
4.1
(2)
2
2
0.77
−
0.87
(3)
2
2
8.4
−
6.4
(4)
2
2
2.8
−
8.8
(5)
2
2
52.4
−
42.4
(6)
2
2
57.3
−
47.3
(7)
2
2
0.89
−
0.69
(8)
2
2
3.6
−
2.6
(9)
2
2
3.18
−
4.18
(10)
2
2
0.38
−
0.68
(11)
2
2
5.1
−
6.1
(12)
2
2
54.1
−
64.1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
2.1
−
4.1
=
(
2.1
−
4.1
)
(
2.1
+
4.1
)
=
−2
×
6.2
=
−12.4
(2)
2
2
0.77
−
0.87
=
(
0.77
−
0.87
)
(
0.77
+
0.87
)
=
−0.1
×
1.64
=
−0.164
(3)
2
2
8.4
−
6.4
=
(
8.4
−
6.4
)
(
8.4
+
6.4
)
=
2
×
14.8
=
29.6
(4)
2
2
2.8
−
8.8
=
(
2.8
−
8.8
)
(
2.8
+
8.8
)
=
−6
×
11.6
=
−69.6
(5)
2
2
52.4
−
42.4
=
(
52.4
−
42.4
)
(
52.4
+
42.4
)
=
10
×
94.8
=
948
(6)
2
2
57.3
−
47.3
=
(
57.3
−
47.3
)
(
57.3
+
47.3
)
=
10
×
104.6
=
1046
(7)
2
2
0.89
−
0.69
=
(
0.89
−
0.69
)
(
0.89
+
0.69
)
=
0.2
×
1.58
=
0.316
(8)
2
2
3.6
−
2.6
=
(
3.6
−
2.6
)
(
3.6
+
2.6
)
=
6.2
(9)
2
2
3.18
−
4.18
=
(
3.18
−
4.18
)
(
3.18
+
4.18
)
=
−7.36
(10)
2
2
0.38
−
0.68
=
(
0.38
−
0.68
)
(
0.38
+
0.68
)
=
−0.3
×
1.06
=
−0.318
(11)
2
2
5.1
−
6.1
=
(
5.1
−
6.1
)
(
5.1
+
6.1
)
=
−11.2
(12)
2
2
54.1
−
64.1
=
(
54.1
−
64.1
)
(
54.1
+
64.1
)
=
−10
×
118.2
=
−1182