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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
6.5
−
7.5
(2)
2
2
0.73
−
0.43
(3)
2
2
7.7
−
6.7
(4)
2
2
0.46
−
0.56
(5)
2
2
59.4
−
49.4
(6)
2
2
0.62
−
0.72
(7)
2
2
4.7
−
3.7
(8)
2
2
8.21
−
7.21
(9)
2
2
0.28
−
0.88
(10)
2
2
3.8
−
7.8
(11)
2
2
6.88
−
5.88
(12)
2
2
0.49
−
0.69
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
6.5
−
7.5
=
(
6.5
−
7.5
)
(
6.5
+
7.5
)
=
−14
(2)
2
2
0.73
−
0.43
=
(
0.73
−
0.43
)
(
0.73
+
0.43
)
=
0.3
×
1.16
=
0.348
(3)
2
2
7.7
−
6.7
=
(
7.7
−
6.7
)
(
7.7
+
6.7
)
=
14.4
(4)
2
2
0.46
−
0.56
=
(
0.46
−
0.56
)
(
0.46
+
0.56
)
=
−0.1
×
1.02
=
−0.102
(5)
2
2
59.4
−
49.4
=
(
59.4
−
49.4
)
(
59.4
+
49.4
)
=
10
×
108.8
=
1088
(6)
2
2
0.62
−
0.72
=
(
0.62
−
0.72
)
(
0.62
+
0.72
)
=
−0.1
×
1.34
=
−0.134
(7)
2
2
4.7
−
3.7
=
(
4.7
−
3.7
)
(
4.7
+
3.7
)
=
8.4
(8)
2
2
8.21
−
7.21
=
(
8.21
−
7.21
)
(
8.21
+
7.21
)
=
15.42
(9)
2
2
0.28
−
0.88
=
(
0.28
−
0.88
)
(
0.28
+
0.88
)
=
−0.6
×
1.16
=
−0.696
(10)
2
2
3.8
−
7.8
=
(
3.8
−
7.8
)
(
3.8
+
7.8
)
=
−4
×
11.6
=
−46.4
(11)
2
2
6.88
−
5.88
=
(
6.88
−
5.88
)
(
6.88
+
5.88
)
=
12.76
(12)
2
2
0.49
−
0.69
=
(
0.49
−
0.69
)
(
0.49
+
0.69
)
=
−0.2
×
1.18
=
−0.236