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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
0.66
−
0.26
(2)
2
2
0.85
−
0.35
(3)
2
2
6.58
−
7.58
(4)
2
2
0.65
−
0.25
(5)
2
2
0.81
−
0.41
(6)
2
2
6.3
−
2.3
(7)
2
2
0.88
−
0.38
(8)
2
2
4.9
−
5.9
(9)
2
2
8.1
−
2.1
(10)
2
2
7.1
−
8.1
(11)
2
2
0.39
−
0.69
(12)
2
2
3.52
−
4.52
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.66
−
0.26
=
(
0.66
−
0.26
)
(
0.66
+
0.26
)
=
0.4
×
0.92
=
0.368
(2)
2
2
0.85
−
0.35
=
(
0.85
−
0.35
)
(
0.85
+
0.35
)
=
0.5
×
1.2
=
0.6
(3)
2
2
6.58
−
7.58
=
(
6.58
−
7.58
)
(
6.58
+
7.58
)
=
−14.16
(4)
2
2
0.65
−
0.25
=
(
0.65
−
0.25
)
(
0.65
+
0.25
)
=
0.4
×
0.9
=
0.36
(5)
2
2
0.81
−
0.41
=
(
0.81
−
0.41
)
(
0.81
+
0.41
)
=
0.4
×
1.22
=
0.488
(6)
2
2
6.3
−
2.3
=
(
6.3
−
2.3
)
(
6.3
+
2.3
)
=
4
×
8.6
=
34.4
(7)
2
2
0.88
−
0.38
=
(
0.88
−
0.38
)
(
0.88
+
0.38
)
=
0.5
×
1.26
=
0.63
(8)
2
2
4.9
−
5.9
=
(
4.9
−
5.9
)
(
4.9
+
5.9
)
=
−10.8
(9)
2
2
8.1
−
2.1
=
(
8.1
−
2.1
)
(
8.1
+
2.1
)
=
6
×
10.2
=
61.2
(10)
2
2
7.1
−
8.1
=
(
7.1
−
8.1
)
(
7.1
+
8.1
)
=
−15.2
(11)
2
2
0.39
−
0.69
=
(
0.39
−
0.69
)
(
0.39
+
0.69
)
=
−0.3
×
1.08
=
−0.324
(12)
2
2
3.52
−
4.52
=
(
3.52
−
4.52
)
(
3.52
+
4.52
)
=
−8.04