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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
37.7
−
47.7
(2)
2
2
0.55
−
0.35
(3)
2
2
5.7
−
7.7
(4)
2
2
0.85
−
0.65
(5)
2
2
3.45
−
4.45
(6)
2
2
0.56
−
0.76
(7)
2
2
85.7
−
95.7
(8)
2
2
34.7
−
24.7
(9)
2
2
69.8
−
59.8
(10)
2
2
4.48
−
5.48
(11)
2
2
8.8
−
3.8
(12)
2
2
6.2
−
8.2
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
37.7
−
47.7
=
(
37.7
−
47.7
)
(
37.7
+
47.7
)
=
−10
×
85.4
=
−854
(2)
2
2
0.55
−
0.35
=
(
0.55
−
0.35
)
(
0.55
+
0.35
)
=
0.2
×
0.9
=
0.18
(3)
2
2
5.7
−
7.7
=
(
5.7
−
7.7
)
(
5.7
+
7.7
)
=
−2
×
13.4
=
−26.8
(4)
2
2
0.85
−
0.65
=
(
0.85
−
0.65
)
(
0.85
+
0.65
)
=
0.2
×
1.5
=
0.3
(5)
2
2
3.45
−
4.45
=
(
3.45
−
4.45
)
(
3.45
+
4.45
)
=
−7.9
(6)
2
2
0.56
−
0.76
=
(
0.56
−
0.76
)
(
0.56
+
0.76
)
=
−0.2
×
1.32
=
−0.264
(7)
2
2
85.7
−
95.7
=
(
85.7
−
95.7
)
(
85.7
+
95.7
)
=
−10
×
181.4
=
−1814
(8)
2
2
34.7
−
24.7
=
(
34.7
−
24.7
)
(
34.7
+
24.7
)
=
10
×
59.4
=
594
(9)
2
2
69.8
−
59.8
=
(
69.8
−
59.8
)
(
69.8
+
59.8
)
=
10
×
129.6
=
1296
(10)
2
2
4.48
−
5.48
=
(
4.48
−
5.48
)
(
4.48
+
5.48
)
=
−9.96
(11)
2
2
8.8
−
3.8
=
(
8.8
−
3.8
)
(
8.8
+
3.8
)
=
5
×
12.6
=
63
(12)
2
2
6.2
−
8.2
=
(
6.2
−
8.2
)
(
6.2
+
8.2
)
=
−2
×
14.4
=
−28.8