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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
3.6
−
6.6
(2)
2
2
0.58
−
0.78
(3)
2
2
5.5
−
4.5
(4)
2
2
67.3
−
57.3
(5)
2
2
4.3
−
8.3
(6)
2
2
0.21
−
0.31
(7)
2
2
5.9
−
8.9
(8)
2
2
49.8
−
59.8
(9)
2
2
0.71
−
0.31
(10)
2
2
6.8
−
5.8
(11)
2
2
22.9
−
32.9
(12)
2
2
0.39
−
0.29
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
3.6
−
6.6
=
(
3.6
−
6.6
)
(
3.6
+
6.6
)
=
−3
×
10.2
=
−30.6
(2)
2
2
0.58
−
0.78
=
(
0.58
−
0.78
)
(
0.58
+
0.78
)
=
−0.2
×
1.36
=
−0.272
(3)
2
2
5.5
−
4.5
=
(
5.5
−
4.5
)
(
5.5
+
4.5
)
=
10
(4)
2
2
67.3
−
57.3
=
(
67.3
−
57.3
)
(
67.3
+
57.3
)
=
10
×
124.6
=
1246
(5)
2
2
4.3
−
8.3
=
(
4.3
−
8.3
)
(
4.3
+
8.3
)
=
−4
×
12.6
=
−50.4
(6)
2
2
0.21
−
0.31
=
(
0.21
−
0.31
)
(
0.21
+
0.31
)
=
−0.1
×
0.52
=
−0.052
(7)
2
2
5.9
−
8.9
=
(
5.9
−
8.9
)
(
5.9
+
8.9
)
=
−3
×
14.8
=
−44.4
(8)
2
2
49.8
−
59.8
=
(
49.8
−
59.8
)
(
49.8
+
59.8
)
=
−10
×
109.6
=
−1096
(9)
2
2
0.71
−
0.31
=
(
0.71
−
0.31
)
(
0.71
+
0.31
)
=
0.4
×
1.02
=
0.408
(10)
2
2
6.8
−
5.8
=
(
6.8
−
5.8
)
(
6.8
+
5.8
)
=
12.6
(11)
2
2
22.9
−
32.9
=
(
22.9
−
32.9
)
(
22.9
+
32.9
)
=
−10
×
55.8
=
−558
(12)
2
2
0.39
−
0.29
=
(
0.39
−
0.29
)
(
0.39
+
0.29
)
=
0.1
×
0.68
=
0.068