［文字サイズの変更］
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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[06C-10]
(1)
(
−
0.8
)
÷
(
＋
1
)
(2)
(
＋
0.6
)
÷
(
＋
1
)
(3)
(
＋
0.4
)
×
(
＋
0.3
)
(4)
(
−
0.04
)
÷
(
＋
0.4
)
(5)
(
＋
0.64
)
÷
(
−
0.8
)
(6)
(
＋
0.08
)
÷
(
＋
0.1
)
(7)
(
−
0.07
)
÷
(
＋
0.7
)
(8)
(
＋
0.36
)
÷
(
−
0.6
)
(9)
(
−
0.4
)
×
(
＋
0.4
)
(10)
(
−
1
)
×
(
＋
0.5
)
(11)
(
＋
0.7
)
÷
(
＋
0.7
)
(12)
(
＋
0.8
)
×
(
−
0.1
)
(13)
(
＋
0.1
)
×
(
＋
0.2
)
(14)
(
−
0.06
)
÷
(
−
0.1
)
(15)
(
＋
0.14
)
÷
(
＋
0.2
)
(16)
(
−
0.54
)
÷
(
＋
0.6
)
(17)
(
−
0.3
)
×
(
＋
0.8
)
(18)
(
−
0.3
)
×
(
＋
0.1
)
(19)
(
＋
0.4
)
×
(
−
0.8
)
(20)
(
−
0.64
)
÷
(
−
0.8
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
−
0.8
)
÷
(
＋
1
)
=
−
(
0.8
÷
1
)
=
−0.8
(2)
(
＋
0.6
)
÷
(
＋
1
)
=
＋
(
0.6
÷
1
)
=
＋
0.6
(3)
(
＋
0.4
)
×
(
＋
0.3
)
=
＋
(
0.4
×
0.3
)
=
＋
0.12
(4)
(
−
0.04
)
÷
(
＋
0.4
)
=
−
(
0.04
÷
0.4
)
=
−0.1
(5)
(
＋
0.64
)
÷
(
−
0.8
)
=
−
(
0.64
÷
0.8
)
=
−0.8
(6)
(
＋
0.08
)
÷
(
＋
0.1
)
=
＋
(
0.08
÷
0.1
)
=
＋
0.8
(7)
(
−
0.07
)
÷
(
＋
0.7
)
=
−
(
0.07
÷
0.7
)
=
−0.1
(8)
(
＋
0.36
)
÷
(
−
0.6
)
=
−
(
0.36
÷
0.6
)
=
−0.6
(9)
(
−
0.4
)
×
(
＋
0.4
)
=
−
(
0.4
×
0.4
)
=
−0.16
(10)
(
−
1
)
×
(
＋
0.5
)
=
−
(
1
×
0.5
)
=
−0.5
(11)
(
＋
0.7
)
÷
(
＋
0.7
)
=
＋
(
0.7
÷
0.7
)
=
＋
1
(12)
(
＋
0.8
)
×
(
−
0.1
)
=
−
(
0.8
×
0.1
)
=
−0.08
(13)
(
＋
0.1
)
×
(
＋
0.2
)
=
＋
(
0.1
×
0.2
)
=
＋
0.02
(14)
(
−
0.06
)
÷
(
−
0.1
)
=
＋
(
0.06
÷
0.1
)
=
＋
0.6
(15)
(
＋
0.14
)
÷
(
＋
0.2
)
=
＋
(
0.14
÷
0.2
)
=
＋
0.7
(16)
(
−
0.54
)
÷
(
＋
0.6
)
=
−
(
0.54
÷
0.6
)
=
−0.9
(17)
(
−
0.3
)
×
(
＋
0.8
)
=
−
(
0.3
×
0.8
)
=
−0.24
(18)
(
−
0.3
)
×
(
＋
0.1
)
=
−
(
0.3
×
0.1
)
=
−0.03
(19)
(
＋
0.4
)
×
(
−
0.8
)
=
−
(
0.4
×
0.8
)
=
−0.32
(20)
(
−
0.64
)
÷
(
−
0.8
)
=
＋
(
0.64
÷
0.8
)
=
＋
0.8