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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
4.7
−
8.7
(2)
2
2
88.4
−
98.4
(3)
2
2
5.2
−
6.2
(4)
2
2
0.49
−
0.89
(5)
2
2
56.6
−
66.6
(6)
2
2
8.4
−
6.4
(7)
2
2
0.72
−
0.62
(8)
2
2
0.73
−
0.53
(9)
2
2
5.6
−
3.6
(10)
2
2
0.22
−
0.72
(11)
2
2
0.72
−
0.52
(12)
2
2
8.5
−
3.5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
4.7
−
8.7
=
(
4.7
−
8.7
)
(
4.7
+
8.7
)
=
−4
×
13.4
=
−53.6
(2)
2
2
88.4
−
98.4
=
(
88.4
−
98.4
)
(
88.4
+
98.4
)
=
−10
×
186.8
=
−1868
(3)
2
2
5.2
−
6.2
=
(
5.2
−
6.2
)
(
5.2
+
6.2
)
=
−11.4
(4)
2
2
0.49
−
0.89
=
(
0.49
−
0.89
)
(
0.49
+
0.89
)
=
−0.4
×
1.38
=
−0.552
(5)
2
2
56.6
−
66.6
=
(
56.6
−
66.6
)
(
56.6
+
66.6
)
=
−10
×
123.2
=
−1232
(6)
2
2
8.4
−
6.4
=
(
8.4
−
6.4
)
(
8.4
+
6.4
)
=
2
×
14.8
=
29.6
(7)
2
2
0.72
−
0.62
=
(
0.72
−
0.62
)
(
0.72
+
0.62
)
=
0.1
×
1.34
=
0.134
(8)
2
2
0.73
−
0.53
=
(
0.73
−
0.53
)
(
0.73
+
0.53
)
=
0.2
×
1.26
=
0.252
(9)
2
2
5.6
−
3.6
=
(
5.6
−
3.6
)
(
5.6
+
3.6
)
=
2
×
9.2
=
18.4
(10)
2
2
0.22
−
0.72
=
(
0.22
−
0.72
)
(
0.22
+
0.72
)
=
−0.5
×
0.94
=
−0.47
(11)
2
2
0.72
−
0.52
=
(
0.72
−
0.52
)
(
0.72
+
0.52
)
=
0.2
×
1.24
=
0.248
(12)
2
2
8.5
−
3.5
=
(
8.5
−
3.5
)
(
8.5
+
3.5
)
=
5
×
12
=
60