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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)
−2.4
−
(
−1.6
)
x
=
−0.4
x
(2)
−1.3
x
＋
0
=
−1.3
x
(3)
−0.4
x
＋
1.7
=
1.14
(4)
−1.2
−
0.1
x
=
1.4
x
(5)
1.5
x
＋
1.61
=
−0.8
x
(6)
2.94
−
(
−1.3
)
x
=
−0.8
x
(7)
−0.7
x
＋
1.9
=
2.6
(8)
−
x
＋
1.9
=
0.8
(9)
0.14
＋
0.8
x
=
x
(10)
−1.08
＋
0.1
x
=
1.3
x
(11)
0.7
x
−
0.8
=
−0.73
(12)
1.8
−
(
−0.9
)
x
=
1.9
x
(13)
0.3
x
−
1.4
=
−1.91
(14)
−0.9
−
1.2
x
=
−2.46
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−2.4
−
(
−1.6
)
x
=
−0.4
x
1.6
x
＋
0.4
x
=
2.4
2
x
=
2.4
x
=
1.2
(2)
−1.3
x
＋
0
=
−1.3
x
−1.3
x
＋
1.3
x
=
0
0
=
0
x
=
NAN
(3)
−0.4
x
＋
1.7
=
1.14
−0.4
x
=
1.14
−
1.7
−0.4
x
=
−0.56
x
=
1.4
(4)
−1.2
−
0.1
x
=
1.4
x
−
0.1
x
−
1.4
x
=
1.2
−1.5
x
=
1.2
x
=
−0.8
(5)
1.5
x
＋
1.61
=
−0.8
x
1.5
x
＋
0.8
x
=
−
1.61
2.3
x
=
−1.61
x
=
−0.7
(6)
2.94
−
(
−1.3
)
x
=
−0.8
x
1.3
x
＋
0.8
x
=
−
2.94
2.1
x
=
−2.94
x
=
−1.4
(7)
−0.7
x
＋
1.9
=
2.6
−0.7
x
=
2.6
−
1.9
−0.7
x
=
0.7
x
=
−1
(8)
−
x
＋
1.9
=
0.8
−
x
=
0.8
−
1.9
−
x
=
−1.1
x
=
1.1
(9)
0.14
＋
0.8
x
=
x
0.8
x
−
x
=
−
0.14
−0.2
x
=
−0.14
x
=
0.7
(10)
−1.08
＋
0.1
x
=
1.3
x
0.1
x
−
1.3
x
=
1.08
−1.2
x
=
1.08
x
=
−0.9
(11)
0.7
x
−
0.8
=
−0.73
0.7
x
=
−0.73
＋
0.8
0.7
x
=
0.07
x
=
0.1
(12)
1.8
−
(
−0.9
)
x
=
1.9
x
0.9
x
−
1.9
x
=
−
1.8
−
x
=
−1.8
x
=
1.8
(13)
0.3
x
−
1.4
=
−1.91
0.3
x
=
−1.91
＋
1.4
0.3
x
=
−0.51
x
=
−1.7
(14)
−0.9
−
1.2
x
=
−2.46
−
1.2
x
=
−2.46
＋
0.9
−
1.2
x
=
−1.56
x
=
1.3