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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
89.2
−
79.2
(2)
2
2
39.6
−
29.6
(3)
2
2
56.6
−
46.6
(4)
2
2
0.26
−
0.76
(5)
2
2
0.51
−
0.31
(6)
2
2
7.3
−
6.3
(7)
2
2
0.28
−
0.88
(8)
2
2
7.1
−
2.1
(9)
2
2
0.32
−
0.62
(10)
2
2
8.13
−
9.13
(11)
2
2
0.79
−
0.59
(12)
2
2
64.2
−
54.2
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
89.2
−
79.2
=
(
89.2
−
79.2
)
(
89.2
+
79.2
)
=
10
×
168.4
=
1684
(2)
2
2
39.6
−
29.6
=
(
39.6
−
29.6
)
(
39.6
+
29.6
)
=
10
×
69.2
=
692
(3)
2
2
56.6
−
46.6
=
(
56.6
−
46.6
)
(
56.6
+
46.6
)
=
10
×
103.2
=
1032
(4)
2
2
0.26
−
0.76
=
(
0.26
−
0.76
)
(
0.26
+
0.76
)
=
−0.5
×
1.02
=
−0.51
(5)
2
2
0.51
−
0.31
=
(
0.51
−
0.31
)
(
0.51
+
0.31
)
=
0.2
×
0.82
=
0.164
(6)
2
2
7.3
−
6.3
=
(
7.3
−
6.3
)
(
7.3
+
6.3
)
=
13.6
(7)
2
2
0.28
−
0.88
=
(
0.28
−
0.88
)
(
0.28
+
0.88
)
=
−0.6
×
1.16
=
−0.696
(8)
2
2
7.1
−
2.1
=
(
7.1
−
2.1
)
(
7.1
+
2.1
)
=
5
×
9.2
=
46
(9)
2
2
0.32
−
0.62
=
(
0.32
−
0.62
)
(
0.32
+
0.62
)
=
−0.3
×
0.94
=
−0.282
(10)
2
2
8.13
−
9.13
=
(
8.13
−
9.13
)
(
8.13
+
9.13
)
=
−17.26
(11)
2
2
0.79
−
0.59
=
(
0.79
−
0.59
)
(
0.79
+
0.59
)
=
0.2
×
1.38
=
0.276
(12)
2
2
64.2
−
54.2
=
(
64.2
−
54.2
)
(
64.2
+
54.2
)
=
10
×
118.4
=
1184