［文字サイズの変更］
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©2024 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[06C-10]
(1)
(
＋
0.9
)
×
(
−
0.9
)
(2)
(
＋
0.6
)
×
(
＋
0.8
)
(3)
(
＋
0.4
)
×
(
−
0.8
)
(4)
(
＋
0.6
)
×
(
＋
0.5
)
(5)
(
＋
0.42
)
÷
(
−
0.6
)
(6)
(
＋
0.28
)
÷
(
＋
0.4
)
(7)
(
＋
0.01
)
÷
(
＋
0.1
)
(8)
(
−
0.2
)
×
(
＋
0.8
)
(9)
(
−
0.9
)
×
(
−
0.4
)
(10)
(
＋
0.1
)
×
(
＋
0.5
)
(11)
(
＋
0.6
)
÷
(
＋
1
)
(12)
(
−
0.16
)
÷
(
−
0.8
)
(13)
(
−
0.9
)
×
(
−
0.4
)
(14)
(
＋
0.6
)
×
(
＋
1
)
(15)
(
＋
0.1
)
×
(
＋
0.2
)
(16)
(
−
0.2
)
×
(
＋
0.1
)
(17)
(
−
0.25
)
÷
(
−
0.5
)
(18)
(
−
0.07
)
÷
(
−
0.7
)
(19)
(
−
0.6
)
×
(
＋
0.6
)
(20)
(
＋
0.2
)
×
(
＋
0.9
)
©2024 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
＋
0.9
)
×
(
−
0.9
)
=
−
(
0.9
×
0.9
)
=
−0.81
(2)
(
＋
0.6
)
×
(
＋
0.8
)
=
＋
(
0.6
×
0.8
)
=
＋
0.48
(3)
(
＋
0.4
)
×
(
−
0.8
)
=
−
(
0.4
×
0.8
)
=
−0.32
(4)
(
＋
0.6
)
×
(
＋
0.5
)
=
＋
(
0.6
×
0.5
)
=
＋
0.3
(5)
(
＋
0.42
)
÷
(
−
0.6
)
=
−
(
0.42
÷
0.6
)
=
−0.7
(6)
(
＋
0.28
)
÷
(
＋
0.4
)
=
＋
(
0.28
÷
0.4
)
=
＋
0.7
(7)
(
＋
0.01
)
÷
(
＋
0.1
)
=
＋
(
0.01
÷
0.1
)
=
＋
0.1
(8)
(
−
0.2
)
×
(
＋
0.8
)
=
−
(
0.2
×
0.8
)
=
−0.16
(9)
(
−
0.9
)
×
(
−
0.4
)
=
＋
(
0.9
×
0.4
)
=
＋
0.36
(10)
(
＋
0.1
)
×
(
＋
0.5
)
=
＋
(
0.1
×
0.5
)
=
＋
0.05
(11)
(
＋
0.6
)
÷
(
＋
1
)
=
＋
(
0.6
÷
1
)
=
＋
0.6
(12)
(
−
0.16
)
÷
(
−
0.8
)
=
＋
(
0.16
÷
0.8
)
=
＋
0.2
(13)
(
−
0.9
)
×
(
−
0.4
)
=
＋
(
0.9
×
0.4
)
=
＋
0.36
(14)
(
＋
0.6
)
×
(
＋
1
)
=
＋
(
0.6
×
1
)
=
＋
0.6
(15)
(
＋
0.1
)
×
(
＋
0.2
)
=
＋
(
0.1
×
0.2
)
=
＋
0.02
(16)
(
−
0.2
)
×
(
＋
0.1
)
=
−
(
0.2
×
0.1
)
=
−0.02
(17)
(
−
0.25
)
÷
(
−
0.5
)
=
＋
(
0.25
÷
0.5
)
=
＋
0.5
(18)
(
−
0.07
)
÷
(
−
0.7
)
=
＋
(
0.07
÷
0.7
)
=
＋
0.1
(19)
(
−
0.6
)
×
(
＋
0.6
)
=
−
(
0.6
×
0.6
)
=
−0.36
(20)
(
＋
0.2
)
×
(
＋
0.9
)
=
＋
(
0.2
×
0.9
)
=
＋
0.18