[文字サイズの変更]
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▲
©2025 数学クラブ http://sugaku.club/
月 日( )
● 計算しなさい
[06C-10]
(1)
(
+
0.2
)
×
(
+
0.4
)
(2)
(
+
0.1
)
÷
(
−
0.2
)
(3)
(
−
0.04
)
÷
(
−
0.2
)
(4)
(
+
0.9
)
÷
(
−
0.9
)
(5)
(
+
0.5
)
×
(
+
0.8
)
(6)
(
−
1
)
×
(
+
0.3
)
(7)
(
−
0.4
)
×
(
−
0.3
)
(8)
(
+
0.12
)
÷
(
−
0.2
)
(9)
(
−
0.7
)
×
(
−
0.9
)
(10)
(
−
0.8
)
÷
(
−
1
)
(11)
(
−
0.56
)
÷
(
+
0.8
)
(12)
(
+
0.6
)
×
(
+
0.1
)
(13)
(
−
0.8
)
×
(
−
0.3
)
(14)
(
−
0.8
)
×
(
−
0.7
)
(15)
(
+
0.2
)
×
(
+
1
)
(16)
(
−
0.5
)
×
(
+
0.2
)
(17)
(
+
0.04
)
÷
(
−
0.2
)
(18)
(
−
0.2
)
×
(
+
0.2
)
(19)
(
+
0.2
)
÷
(
+
1
)
(20)
(
+
0.4
)
×
(
+
0.8
)
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
+
0.2
)
×
(
+
0.4
)
=
+
(
0.2
×
0.4
)
=
+
0.08
(2)
(
+
0.1
)
÷
(
−
0.2
)
=
−
(
0.1
÷
0.2
)
=
−0.5
(3)
(
−
0.04
)
÷
(
−
0.2
)
=
+
(
0.04
÷
0.2
)
=
+
0.2
(4)
(
+
0.9
)
÷
(
−
0.9
)
=
−
(
0.9
÷
0.9
)
=
−1
(5)
(
+
0.5
)
×
(
+
0.8
)
=
+
(
0.5
×
0.8
)
=
+
0.4
(6)
(
−
1
)
×
(
+
0.3
)
=
−
(
1
×
0.3
)
=
−0.3
(7)
(
−
0.4
)
×
(
−
0.3
)
=
+
(
0.4
×
0.3
)
=
+
0.12
(8)
(
+
0.12
)
÷
(
−
0.2
)
=
−
(
0.12
÷
0.2
)
=
−0.6
(9)
(
−
0.7
)
×
(
−
0.9
)
=
+
(
0.7
×
0.9
)
=
+
0.63
(10)
(
−
0.8
)
÷
(
−
1
)
=
+
(
0.8
÷
1
)
=
+
0.8
(11)
(
−
0.56
)
÷
(
+
0.8
)
=
−
(
0.56
÷
0.8
)
=
−0.7
(12)
(
+
0.6
)
×
(
+
0.1
)
=
+
(
0.6
×
0.1
)
=
+
0.06
(13)
(
−
0.8
)
×
(
−
0.3
)
=
+
(
0.8
×
0.3
)
=
+
0.24
(14)
(
−
0.8
)
×
(
−
0.7
)
=
+
(
0.8
×
0.7
)
=
+
0.56
(15)
(
+
0.2
)
×
(
+
1
)
=
+
(
0.2
×
1
)
=
+
0.2
(16)
(
−
0.5
)
×
(
+
0.2
)
=
−
(
0.5
×
0.2
)
=
−0.1
(17)
(
+
0.04
)
÷
(
−
0.2
)
=
−
(
0.04
÷
0.2
)
=
−0.2
(18)
(
−
0.2
)
×
(
+
0.2
)
=
−
(
0.2
×
0.2
)
=
−0.04
(19)
(
+
0.2
)
÷
(
+
1
)
=
+
(
0.2
÷
1
)
=
+
0.2
(20)
(
+
0.4
)
×
(
+
0.8
)
=
+
(
0.4
×
0.8
)
=
+
0.32