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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C0-10]
(1)
2
2
54.1
−
64.1
(2)
2
2
0.61
−
0.51
(3)
2
2
3.9
−
8.9
(4)
2
2
0.87
−
0.57
(5)
2
2
83.8
−
93.8
(6)
2
2
0.23
−
0.53
(7)
2
2
0.81
−
0.41
(8)
2
2
88.3
−
78.3
(9)
2
2
5.12
−
4.12
(10)
2
2
0.71
−
0.51
(11)
2
2
6.6
−
2.6
(12)
2
2
0.68
−
0.88
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
54.1
−
64.1
=
(
54.1
−
64.1
)
(
54.1
+
64.1
)
=
−10
×
118.2
=
−1182
(2)
2
2
0.61
−
0.51
=
(
0.61
−
0.51
)
(
0.61
+
0.51
)
=
0.1
×
1.12
=
0.112
(3)
2
2
3.9
−
8.9
=
(
3.9
−
8.9
)
(
3.9
+
8.9
)
=
−5
×
12.8
=
−64
(4)
2
2
0.87
−
0.57
=
(
0.87
−
0.57
)
(
0.87
+
0.57
)
=
0.3
×
1.44
=
0.432
(5)
2
2
83.8
−
93.8
=
(
83.8
−
93.8
)
(
83.8
+
93.8
)
=
−10
×
177.6
=
−1776
(6)
2
2
0.23
−
0.53
=
(
0.23
−
0.53
)
(
0.23
+
0.53
)
=
−0.3
×
0.76
=
−0.228
(7)
2
2
0.81
−
0.41
=
(
0.81
−
0.41
)
(
0.81
+
0.41
)
=
0.4
×
1.22
=
0.488
(8)
2
2
88.3
−
78.3
=
(
88.3
−
78.3
)
(
88.3
+
78.3
)
=
10
×
166.6
=
1666
(9)
2
2
5.12
−
4.12
=
(
5.12
−
4.12
)
(
5.12
+
4.12
)
=
9.24
(10)
2
2
0.71
−
0.51
=
(
0.71
−
0.51
)
(
0.71
+
0.51
)
=
0.2
×
1.22
=
0.244
(11)
2
2
6.6
−
2.6
=
(
6.6
−
2.6
)
(
6.6
+
2.6
)
=
4
×
9.2
=
36.8
(12)
2
2
0.68
−
0.88
=
(
0.68
−
0.88
)
(
0.68
+
0.88
)
=
−0.2
×
1.56
=
−0.312