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©2024 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C0-10]
(1)
2
2
8.6
−
2.6
(2)
2
2
22.8
−
32.8
(3)
2
2
0.84
−
0.44
(4)
2
2
5.4
−
6.4
(5)
2
2
0.38
−
0.88
(6)
2
2
2.22
−
3.22
(7)
2
2
2.6
−
7.6
(8)
2
2
0.23
−
0.63
(9)
2
2
5.1
−
3.1
(10)
2
2
0.25
−
0.85
(11)
2
2
26.4
−
36.4
(12)
2
2
0.62
−
0.52
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
8.6
−
2.6
=
(
8.6
−
2.6
)
(
8.6
+
2.6
)
=
6
×
11.2
=
67.2
(2)
2
2
22.8
−
32.8
=
(
22.8
−
32.8
)
(
22.8
+
32.8
)
=
−10
×
55.6
=
−556
(3)
2
2
0.84
−
0.44
=
(
0.84
−
0.44
)
(
0.84
+
0.44
)
=
0.4
×
1.28
=
0.512
(4)
2
2
5.4
−
6.4
=
(
5.4
−
6.4
)
(
5.4
+
6.4
)
=
−11.8
(5)
2
2
0.38
−
0.88
=
(
0.38
−
0.88
)
(
0.38
+
0.88
)
=
−0.5
×
1.26
=
−0.63
(6)
2
2
2.22
−
3.22
=
(
2.22
−
3.22
)
(
2.22
+
3.22
)
=
−5.44
(7)
2
2
2.6
−
7.6
=
(
2.6
−
7.6
)
(
2.6
+
7.6
)
=
−5
×
10.2
=
−51
(8)
2
2
0.23
−
0.63
=
(
0.23
−
0.63
)
(
0.23
+
0.63
)
=
−0.4
×
0.86
=
−0.344
(9)
2
2
5.1
−
3.1
=
(
5.1
−
3.1
)
(
5.1
+
3.1
)
=
2
×
8.2
=
16.4
(10)
2
2
0.25
−
0.85
=
(
0.25
−
0.85
)
(
0.25
+
0.85
)
=
−0.6
×
1.1
=
−0.66
(11)
2
2
26.4
−
36.4
=
(
26.4
−
36.4
)
(
26.4
+
36.4
)
=
−10
×
62.8
=
−628
(12)
2
2
0.62
−
0.52
=
(
0.62
−
0.52
)
(
0.62
+
0.52
)
=
0.1
×
1.14
=
0.114