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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
2.7
−
3.7
(2)
2
2
0.66
−
0.86
(3)
2
2
5.2
−
7.2
(4)
2
2
4.39
−
3.39
(5)
2
2
3.2
−
6.2
(6)
2
2
8.2
−
2.2
(7)
2
2
3.9
−
6.9
(8)
2
2
4.4
−
7.4
(9)
2
2
8.8
−
7.8
(10)
2
2
5.83
−
6.83
(11)
2
2
0.29
−
0.89
(12)
2
2
8.3
−
6.3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
2.7
−
3.7
=
(
2.7
−
3.7
)
(
2.7
+
3.7
)
=
−6.4
(2)
2
2
0.66
−
0.86
=
(
0.66
−
0.86
)
(
0.66
+
0.86
)
=
−0.2
×
1.52
=
−0.304
(3)
2
2
5.2
−
7.2
=
(
5.2
−
7.2
)
(
5.2
+
7.2
)
=
−2
×
12.4
=
−24.8
(4)
2
2
4.39
−
3.39
=
(
4.39
−
3.39
)
(
4.39
+
3.39
)
=
7.78
(5)
2
2
3.2
−
6.2
=
(
3.2
−
6.2
)
(
3.2
+
6.2
)
=
−3
×
9.4
=
−28.2
(6)
2
2
8.2
−
2.2
=
(
8.2
−
2.2
)
(
8.2
+
2.2
)
=
6
×
10.4
=
62.4
(7)
2
2
3.9
−
6.9
=
(
3.9
−
6.9
)
(
3.9
+
6.9
)
=
−3
×
10.8
=
−32.4
(8)
2
2
4.4
−
7.4
=
(
4.4
−
7.4
)
(
4.4
+
7.4
)
=
−3
×
11.8
=
−35.4
(9)
2
2
8.8
−
7.8
=
(
8.8
−
7.8
)
(
8.8
+
7.8
)
=
16.6
(10)
2
2
5.83
−
6.83
=
(
5.83
−
6.83
)
(
5.83
+
6.83
)
=
−12.66
(11)
2
2
0.29
−
0.89
=
(
0.29
−
0.89
)
(
0.29
+
0.89
)
=
−0.6
×
1.18
=
−0.708
(12)
2
2
8.3
−
6.3
=
(
8.3
−
6.3
)
(
8.3
+
6.3
)
=
2
×
14.6
=
29.2