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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
0.84
−
0.74
(2)
2
2
0.22
−
0.52
(3)
2
2
3.2
−
6.2
(4)
2
2
4.56
−
5.56
(5)
2
2
7.4
−
4.4
(6)
2
2
0.69
−
0.89
(7)
2
2
7.14
−
6.14
(8)
2
2
2.9
−
4.9
(9)
2
2
0.47
−
0.77
(10)
2
2
6.3
−
8.3
(11)
2
2
5.1
−
4.1
(12)
2
2
6.3
−
7.3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.84
−
0.74
=
(
0.84
−
0.74
)
(
0.84
+
0.74
)
=
0.1
×
1.58
=
0.158
(2)
2
2
0.22
−
0.52
=
(
0.22
−
0.52
)
(
0.22
+
0.52
)
=
−0.3
×
0.74
=
−0.222
(3)
2
2
3.2
−
6.2
=
(
3.2
−
6.2
)
(
3.2
+
6.2
)
=
−3
×
9.4
=
−28.2
(4)
2
2
4.56
−
5.56
=
(
4.56
−
5.56
)
(
4.56
+
5.56
)
=
−10.12
(5)
2
2
7.4
−
4.4
=
(
7.4
−
4.4
)
(
7.4
+
4.4
)
=
3
×
11.8
=
35.4
(6)
2
2
0.69
−
0.89
=
(
0.69
−
0.89
)
(
0.69
+
0.89
)
=
−0.2
×
1.58
=
−0.316
(7)
2
2
7.14
−
6.14
=
(
7.14
−
6.14
)
(
7.14
+
6.14
)
=
13.28
(8)
2
2
2.9
−
4.9
=
(
2.9
−
4.9
)
(
2.9
+
4.9
)
=
−2
×
7.8
=
−15.6
(9)
2
2
0.47
−
0.77
=
(
0.47
−
0.77
)
(
0.47
+
0.77
)
=
−0.3
×
1.24
=
−0.372
(10)
2
2
6.3
−
8.3
=
(
6.3
−
8.3
)
(
6.3
+
8.3
)
=
−2
×
14.6
=
−29.2
(11)
2
2
5.1
−
4.1
=
(
5.1
−
4.1
)
(
5.1
+
4.1
)
=
9.2
(12)
2
2
6.3
−
7.3
=
(
6.3
−
7.3
)
(
6.3
+
7.3
)
=
−13.6