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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
3.9
−
7.9
(2)
2
2
87.3
−
97.3
(3)
2
2
54.6
−
44.6
(4)
2
2
0.82
−
0.22
(5)
2
2
82.8
−
72.8
(6)
2
2
3.4
−
8.4
(7)
2
2
0.51
−
0.61
(8)
2
2
0.74
−
0.54
(9)
2
2
85.9
−
95.9
(10)
2
2
6.73
−
7.73
(11)
2
2
0.86
−
0.66
(12)
2
2
7.8
−
6.8
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
3.9
−
7.9
=
(
3.9
−
7.9
)
(
3.9
+
7.9
)
=
−4
×
11.8
=
−47.2
(2)
2
2
87.3
−
97.3
=
(
87.3
−
97.3
)
(
87.3
+
97.3
)
=
−10
×
184.6
=
−1846
(3)
2
2
54.6
−
44.6
=
(
54.6
−
44.6
)
(
54.6
+
44.6
)
=
10
×
99.2
=
992
(4)
2
2
0.82
−
0.22
=
(
0.82
−
0.22
)
(
0.82
+
0.22
)
=
0.6
×
1.04
=
0.624
(5)
2
2
82.8
−
72.8
=
(
82.8
−
72.8
)
(
82.8
+
72.8
)
=
10
×
155.6
=
1556
(6)
2
2
3.4
−
8.4
=
(
3.4
−
8.4
)
(
3.4
+
8.4
)
=
−5
×
11.8
=
−59
(7)
2
2
0.51
−
0.61
=
(
0.51
−
0.61
)
(
0.51
+
0.61
)
=
−0.1
×
1.12
=
−0.112
(8)
2
2
0.74
−
0.54
=
(
0.74
−
0.54
)
(
0.74
+
0.54
)
=
0.2
×
1.28
=
0.256
(9)
2
2
85.9
−
95.9
=
(
85.9
−
95.9
)
(
85.9
+
95.9
)
=
−10
×
181.8
=
−1818
(10)
2
2
6.73
−
7.73
=
(
6.73
−
7.73
)
(
6.73
+
7.73
)
=
−14.46
(11)
2
2
0.86
−
0.66
=
(
0.86
−
0.66
)
(
0.86
+
0.66
)
=
0.2
×
1.52
=
0.304
(12)
2
2
7.8
−
6.8
=
(
7.8
−
6.8
)
(
7.8
+
6.8
)
=
14.6