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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
0.44
−
0.84
(2)
2
2
6.91
−
7.91
(3)
2
2
0.45
−
0.55
(4)
2
2
0.48
−
0.78
(5)
2
2
6.8
−
2.8
(6)
2
2
2.4
−
4.4
(7)
2
2
5.61
−
6.61
(8)
2
2
41.9
−
51.9
(9)
2
2
0.49
−
0.59
(10)
2
2
0.46
−
0.76
(11)
2
2
0.51
−
0.21
(12)
2
2
4.6
−
2.6
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.44
−
0.84
=
(
0.44
−
0.84
)
(
0.44
+
0.84
)
=
−0.4
×
1.28
=
−0.512
(2)
2
2
6.91
−
7.91
=
(
6.91
−
7.91
)
(
6.91
+
7.91
)
=
−14.82
(3)
2
2
0.45
−
0.55
=
(
0.45
−
0.55
)
(
0.45
+
0.55
)
=
−0.1
(4)
2
2
0.48
−
0.78
=
(
0.48
−
0.78
)
(
0.48
+
0.78
)
=
−0.3
×
1.26
=
−0.378
(5)
2
2
6.8
−
2.8
=
(
6.8
−
2.8
)
(
6.8
+
2.8
)
=
4
×
9.6
=
38.4
(6)
2
2
2.4
−
4.4
=
(
2.4
−
4.4
)
(
2.4
+
4.4
)
=
−2
×
6.8
=
−13.6
(7)
2
2
5.61
−
6.61
=
(
5.61
−
6.61
)
(
5.61
+
6.61
)
=
−12.22
(8)
2
2
41.9
−
51.9
=
(
41.9
−
51.9
)
(
41.9
+
51.9
)
=
−10
×
93.8
=
−938
(9)
2
2
0.49
−
0.59
=
(
0.49
−
0.59
)
(
0.49
+
0.59
)
=
−0.1
×
1.08
=
−0.108
(10)
2
2
0.46
−
0.76
=
(
0.46
−
0.76
)
(
0.46
+
0.76
)
=
−0.3
×
1.22
=
−0.366
(11)
2
2
0.51
−
0.21
=
(
0.51
−
0.21
)
(
0.51
+
0.21
)
=
0.3
×
0.72
=
0.216
(12)
2
2
4.6
−
2.6
=
(
4.6
−
2.6
)
(
4.6
+
2.6
)
=
2
×
7.2
=
14.4