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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-10]
(1)
0.8
x
−
1.2
=
−0.16
(2)
1.3
＋
0.6
x
=
1.42
(3)
−1.8
−
2
x
=
1.6
x
(4)
2
x
−
(
−0.2
)
=
0.4
(5)
−0.18
−
0.1
x
=
−0.4
x
(6)
−2.4
−
(
−0.8
)
x
=
2
x
(7)
1.9
x
−
(
−3.3
)
=
−1.1
x
(8)
−1.9
x
−
1.19
=
−1.2
x
(9)
1.7
x
−
1.4
=
0.47
(10)
−1.2
＋
(
−1.8
)
x
=
−3.54
(11)
−0.8
x
＋
(
−0.48
)
=
−1.4
x
(12)
−0.5
＋
1.3
x
=
−0.89
(13)
−0.6
＋
(
−0.8
)
x
=
−2
x
(14)
−2
＋
0.8
x
=
−2.48
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
0.8
x
−
1.2
=
−0.16
0.8
x
=
−0.16
＋
1.2
0.8
x
=
1.04
x
=
1.3
(2)
1.3
＋
0.6
x
=
1.42
0.6
x
=
1.42
−
1.3
0.6
x
=
0.12
x
=
0.2
(3)
−1.8
−
2
x
=
1.6
x
−
2
x
−
1.6
x
=
1.8
−3.6
x
=
1.8
x
=
−0.5
(4)
2
x
−
(
−0.2
)
=
0.4
2
x
=
0.4
−
0.2
2
x
=
0.2
x
=
0.1
(5)
−0.18
−
0.1
x
=
−0.4
x
−
0.1
x
＋
0.4
x
=
0.18
0.3
x
=
0.18
x
=
0.6
(6)
−2.4
−
(
−0.8
)
x
=
2
x
0.8
x
−
2
x
=
2.4
−1.2
x
=
2.4
x
=
−2
(7)
1.9
x
−
(
−3.3
)
=
−1.1
x
1.9
x
＋
1.1
x
=
−3.3
3
x
=
−3.3
x
=
−1.1
(8)
−1.9
x
−
1.19
=
−1.2
x
−1.9
x
＋
1.2
x
=
1.19
−0.7
x
=
1.19
x
=
−1.7
(9)
1.7
x
−
1.4
=
0.47
1.7
x
=
0.47
＋
1.4
1.7
x
=
1.87
x
=
1.1
(10)
−1.2
＋
(
−1.8
)
x
=
−3.54
−1.8
x
=
−3.54
＋
1.2
−1.8
x
=
−2.34
x
=
1.3
(11)
−0.8
x
＋
(
−0.48
)
=
−1.4
x
−0.8
x
＋
1.4
x
=
0.48
0.6
x
=
0.48
x
=
0.8
(12)
−0.5
＋
1.3
x
=
−0.89
1.3
x
=
−0.89
＋
0.5
1.3
x
=
−0.39
x
=
−0.3
(13)
−0.6
＋
(
−0.8
)
x
=
−2
x
−0.8
x
＋
2
x
=
0.6
1.2
x
=
0.6
x
=
0.5
(14)
−2
＋
0.8
x
=
−2.48
0.8
x
=
−2.48
＋
2
0.8
x
=
−0.48
x
=
−0.6