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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
0.57
−
0.77
(2)
2
2
4.55
−
5.55
(3)
2
2
5.2
−
6.2
(4)
2
2
2.71
−
1.71
(5)
2
2
0.59
−
0.39
(6)
2
2
87.2
−
77.2
(7)
2
2
4.6
−
3.6
(8)
2
2
4.3
−
8.3
(9)
2
2
0.68
−
0.28
(10)
2
2
4.4
−
3.4
(11)
2
2
3.5
−
8.5
(12)
2
2
59.8
−
49.8
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.57
−
0.77
=
(
0.57
−
0.77
)
(
0.57
+
0.77
)
=
−0.2
×
1.34
=
−0.268
(2)
2
2
4.55
−
5.55
=
(
4.55
−
5.55
)
(
4.55
+
5.55
)
=
−10.1
(3)
2
2
5.2
−
6.2
=
(
5.2
−
6.2
)
(
5.2
+
6.2
)
=
−11.4
(4)
2
2
2.71
−
1.71
=
(
2.71
−
1.71
)
(
2.71
+
1.71
)
=
4.42
(5)
2
2
0.59
−
0.39
=
(
0.59
−
0.39
)
(
0.59
+
0.39
)
=
0.2
×
0.98
=
0.196
(6)
2
2
87.2
−
77.2
=
(
87.2
−
77.2
)
(
87.2
+
77.2
)
=
10
×
164.4
=
1644
(7)
2
2
4.6
−
3.6
=
(
4.6
−
3.6
)
(
4.6
+
3.6
)
=
8.2
(8)
2
2
4.3
−
8.3
=
(
4.3
−
8.3
)
(
4.3
+
8.3
)
=
−4
×
12.6
=
−50.4
(9)
2
2
0.68
−
0.28
=
(
0.68
−
0.28
)
(
0.68
+
0.28
)
=
0.4
×
0.96
=
0.384
(10)
2
2
4.4
−
3.4
=
(
4.4
−
3.4
)
(
4.4
+
3.4
)
=
7.8
(11)
2
2
3.5
−
8.5
=
(
3.5
−
8.5
)
(
3.5
+
8.5
)
=
−5
×
12
=
−60
(12)
2
2
59.8
−
49.8
=
(
59.8
−
49.8
)
(
59.8
+
49.8
)
=
10
×
109.6
=
1096