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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)
−0.65
＋
0.9
x
=
1.4
x
(2)
−1.9
x
−
0.1
=
−3.14
(3)
−0.1
−
0.4
x
=
−0.26
(4)
0.9
x
＋
(
−0.9
)
=
0.45
(5)
−1.5
＋
1.1
x
=
0.48
(6)
0.2
−
0.6
x
=
0.62
(7)
−0.2
x
＋
(
−3.23
)
=
1.7
x
(8)
−0.7
x
−
(
−0.2
)
=
−0.99
(9)
−1.1
x
＋
(
−0.05
)
=
−1.2
x
(10)
−0.6
＋
1.3
x
=
−2.42
(11)
−0.22
−
0.4
x
=
−0.2
x
(12)
0.3
x
−
0
=
0.3
x
(13)
0.06
＋
(
−1.1
)
x
=
−0.5
x
(14)
−2.66
−
(
−0.1
)
x
=
2
x
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−0.65
＋
0.9
x
=
1.4
x
0.9
x
−
1.4
x
=
0.65
−0.5
x
=
0.65
x
=
−1.3
(2)
−1.9
x
−
0.1
=
−3.14
−1.9
x
=
−3.14
＋
0.1
−1.9
x
=
−3.04
x
=
1.6
(3)
−0.1
−
0.4
x
=
−0.26
−
0.4
x
=
−0.26
＋
0.1
−
0.4
x
=
−0.16
x
=
0.4
(4)
0.9
x
＋
(
−0.9
)
=
0.45
0.9
x
=
0.45
＋
0.9
0.9
x
=
1.35
x
=
1.5
(5)
−1.5
＋
1.1
x
=
0.48
1.1
x
=
0.48
＋
1.5
1.1
x
=
1.98
x
=
1.8
(6)
0.2
−
0.6
x
=
0.62
−
0.6
x
=
0.62
−
0.2
−
0.6
x
=
0.42
x
=
−0.7
(7)
−0.2
x
＋
(
−3.23
)
=
1.7
x
−0.2
x
−
1.7
x
=
3.23
−1.9
x
=
3.23
x
=
−1.7
(8)
−0.7
x
−
(
−0.2
)
=
−0.99
−0.7
x
=
−0.99
−
0.2
−0.7
x
=
−1.19
x
=
1.7
(9)
−1.1
x
＋
(
−0.05
)
=
−1.2
x
−1.1
x
＋
1.2
x
=
0.05
0.1
x
=
0.05
x
=
0.5
(10)
−0.6
＋
1.3
x
=
−2.42
1.3
x
=
−2.42
＋
0.6
1.3
x
=
−1.82
x
=
−1.4
(11)
−0.22
−
0.4
x
=
−0.2
x
−
0.4
x
＋
0.2
x
=
0.22
−0.2
x
=
0.22
x
=
−1.1
(12)
0.3
x
−
0
=
0.3
x
0.3
x
−
0.3
x
=
0
0
=
0
x
=
NAN
(13)
0.06
＋
(
−1.1
)
x
=
−0.5
x
−1.1
x
＋
0.5
x
=
−
0.06
−0.6
x
=
−0.06
x
=
0.1
(14)
−2.66
−
(
−0.1
)
x
=
2
x
0.1
x
−
2
x
=
2.66
−1.9
x
=
2.66
x
=
−1.4