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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
3.1
−
2.1
(2)
2
2
0.84
−
0.34
(3)
2
2
0.88
−
0.28
(4)
2
2
3.1
−
4.1
(5)
2
2
0.22
−
0.42
(6)
2
2
7.53
−
8.53
(7)
2
2
45.6
−
35.6
(8)
2
2
0.23
−
0.33
(9)
2
2
43.5
−
53.5
(10)
2
2
7.84
−
6.84
(11)
2
2
0.48
−
0.68
(12)
2
2
0.51
−
0.61
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
3.1
−
2.1
=
(
3.1
−
2.1
)
(
3.1
+
2.1
)
=
5.2
(2)
2
2
0.84
−
0.34
=
(
0.84
−
0.34
)
(
0.84
+
0.34
)
=
0.5
×
1.18
=
0.59
(3)
2
2
0.88
−
0.28
=
(
0.88
−
0.28
)
(
0.88
+
0.28
)
=
0.6
×
1.16
=
0.696
(4)
2
2
3.1
−
4.1
=
(
3.1
−
4.1
)
(
3.1
+
4.1
)
=
−7.2
(5)
2
2
0.22
−
0.42
=
(
0.22
−
0.42
)
(
0.22
+
0.42
)
=
−0.2
×
0.64
=
−0.128
(6)
2
2
7.53
−
8.53
=
(
7.53
−
8.53
)
(
7.53
+
8.53
)
=
−16.06
(7)
2
2
45.6
−
35.6
=
(
45.6
−
35.6
)
(
45.6
+
35.6
)
=
10
×
81.2
=
812
(8)
2
2
0.23
−
0.33
=
(
0.23
−
0.33
)
(
0.23
+
0.33
)
=
−0.1
×
0.56
=
−0.056
(9)
2
2
43.5
−
53.5
=
(
43.5
−
53.5
)
(
43.5
+
53.5
)
=
−10
×
97
=
−970
(10)
2
2
7.84
−
6.84
=
(
7.84
−
6.84
)
(
7.84
+
6.84
)
=
14.68
(11)
2
2
0.48
−
0.68
=
(
0.48
−
0.68
)
(
0.48
+
0.68
)
=
−0.2
×
1.16
=
−0.232
(12)
2
2
0.51
−
0.61
=
(
0.51
−
0.61
)
(
0.51
+
0.61
)
=
−0.1
×
1.12
=
−0.112