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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-10]
(1)
−0.4
x
＋
(
−0.6
)
=
0.08
(2)
0.8
x
＋
1.7
=
1.06
(3)
−0.2
x
＋
0.4
=
0.78
(4)
−2
x
−
0.9
=
−3.1
(5)
−1.8
＋
(
−0.2
)
x
=
−2.08
(6)
−1.2
x
−
1.1
=
−3.26
(7)
−1.1
−
0.4
x
=
−0.86
(8)
−0.5
x
＋
1
=
0.35
(9)
2
x
−
1.7
=
−0.1
(10)
−0.2
x
−
1.54
=
−1.3
x
(11)
−2
＋
0.3
x
=
−1.97
(12)
−0.5
x
−
1.7
=
−2.6
(13)
−0.9
x
＋
1.19
=
−0.2
x
(14)
0.7
x
−
0.8
=
0.32
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−0.4
x
＋
(
−0.6
)
=
0.08
−0.4
x
=
0.08
＋
0.6
−0.4
x
=
0.68
x
=
−1.7
(2)
0.8
x
＋
1.7
=
1.06
0.8
x
=
1.06
−
1.7
0.8
x
=
−0.64
x
=
−0.8
(3)
−0.2
x
＋
0.4
=
0.78
−0.2
x
=
0.78
−
0.4
−0.2
x
=
0.38
x
=
−1.9
(4)
−2
x
−
0.9
=
−3.1
−2
x
=
−3.1
＋
0.9
−2
x
=
−2.2
x
=
1.1
(5)
−1.8
＋
(
−0.2
)
x
=
−2.08
−0.2
x
=
−2.08
＋
1.8
−0.2
x
=
−0.28
x
=
1.4
(6)
−1.2
x
−
1.1
=
−3.26
−1.2
x
=
−3.26
＋
1.1
−1.2
x
=
−2.16
x
=
1.8
(7)
−1.1
−
0.4
x
=
−0.86
−
0.4
x
=
−0.86
＋
1.1
−
0.4
x
=
0.24
x
=
−0.6
(8)
−0.5
x
＋
1
=
0.35
−0.5
x
=
0.35
−
1
−0.5
x
=
−0.65
x
=
1.3
(9)
2
x
−
1.7
=
−0.1
2
x
=
−0.1
＋
1.7
2
x
=
1.6
x
=
0.8
(10)
−0.2
x
−
1.54
=
−1.3
x
−0.2
x
＋
1.3
x
=
1.54
1.1
x
=
1.54
x
=
1.4
(11)
−2
＋
0.3
x
=
−1.97
0.3
x
=
−1.97
＋
2
0.3
x
=
0.03
x
=
0.1
(12)
−0.5
x
−
1.7
=
−2.6
−0.5
x
=
−2.6
＋
1.7
−0.5
x
=
−0.9
x
=
1.8
(13)
−0.9
x
＋
1.19
=
−0.2
x
−0.9
x
＋
0.2
x
=
−
1.19
−0.7
x
=
−1.19
x
=
1.7
(14)
0.7
x
−
0.8
=
0.32
0.7
x
=
0.32
＋
0.8
0.7
x
=
1.12
x
=
1.6