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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
0.57
−
0.67
(2)
2
2
6.57
−
7.57
(3)
2
2
4.7
−
5.7
(4)
2
2
7.21
−
6.21
(5)
2
2
4.1
−
6.1
(6)
2
2
0.57
−
0.67
(7)
2
2
0.88
−
0.38
(8)
2
2
6.4
−
8.4
(9)
2
2
83.6
−
73.6
(10)
2
2
0.29
−
0.49
(11)
2
2
2.8
−
6.8
(12)
2
2
8.7
−
7.7
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.57
−
0.67
=
(
0.57
−
0.67
)
(
0.57
+
0.67
)
=
−0.1
×
1.24
=
−0.124
(2)
2
2
6.57
−
7.57
=
(
6.57
−
7.57
)
(
6.57
+
7.57
)
=
−14.14
(3)
2
2
4.7
−
5.7
=
(
4.7
−
5.7
)
(
4.7
+
5.7
)
=
−10.4
(4)
2
2
7.21
−
6.21
=
(
7.21
−
6.21
)
(
7.21
+
6.21
)
=
13.42
(5)
2
2
4.1
−
6.1
=
(
4.1
−
6.1
)
(
4.1
+
6.1
)
=
−2
×
10.2
=
−20.4
(6)
2
2
0.57
−
0.67
=
(
0.57
−
0.67
)
(
0.57
+
0.67
)
=
−0.1
×
1.24
=
−0.124
(7)
2
2
0.88
−
0.38
=
(
0.88
−
0.38
)
(
0.88
+
0.38
)
=
0.5
×
1.26
=
0.63
(8)
2
2
6.4
−
8.4
=
(
6.4
−
8.4
)
(
6.4
+
8.4
)
=
−2
×
14.8
=
−29.6
(9)
2
2
83.6
−
73.6
=
(
83.6
−
73.6
)
(
83.6
+
73.6
)
=
10
×
157.2
=
1572
(10)
2
2
0.29
−
0.49
=
(
0.29
−
0.49
)
(
0.29
+
0.49
)
=
−0.2
×
0.78
=
−0.156
(11)
2
2
2.8
−
6.8
=
(
2.8
−
6.8
)
(
2.8
+
6.8
)
=
−4
×
9.6
=
−38.4
(12)
2
2
8.7
−
7.7
=
(
8.7
−
7.7
)
(
8.7
+
7.7
)
=
16.4