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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)
−0.25
−
(
−1.5
)
x
=
x
(2)
0.8
x
−
0.8
=
−0.48
(3)
0.4
x
−
1
=
−0.2
(4)
−1.3
−
1.3
x
=
−2.21
(5)
0.5
x
＋
(
−1.7
)
=
−1.95
(6)
1.1
＋
(
−1.3
)
x
=
1.36
(7)
−0.5
＋
(
−0.7
)
x
=
−1.06
(8)
0.2
＋
x
=
1.7
(9)
1.9
−
1.3
x
=
4.37
(10)
−1.6
x
−
(
−0.12
)
=
−
x
(11)
−0.28
＋
0.6
x
=
1.3
x
(12)
−2.53
＋
0.9
x
=
−1.4
x
(13)
1.6
x
−
(
−3.4
)
=
−1.8
x
(14)
1.7
x
−
(
−4.08
)
=
−0.7
x
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−0.25
−
(
−1.5
)
x
=
x
1.5
x
−
x
=
0.25
0.5
x
=
0.25
x
=
0.5
(2)
0.8
x
−
0.8
=
−0.48
0.8
x
=
−0.48
＋
0.8
0.8
x
=
0.32
x
=
0.4
(3)
0.4
x
−
1
=
−0.2
0.4
x
=
−0.2
＋
1
0.4
x
=
0.8
x
=
2
(4)
−1.3
−
1.3
x
=
−2.21
−
1.3
x
=
−2.21
＋
1.3
−
1.3
x
=
−0.91
x
=
0.7
(5)
0.5
x
＋
(
−1.7
)
=
−1.95
0.5
x
=
−1.95
＋
1.7
0.5
x
=
−0.25
x
=
−0.5
(6)
1.1
＋
(
−1.3
)
x
=
1.36
−1.3
x
=
1.36
−
1.1
−1.3
x
=
0.26
x
=
−0.2
(7)
−0.5
＋
(
−0.7
)
x
=
−1.06
−0.7
x
=
−1.06
＋
0.5
−0.7
x
=
−0.56
x
=
0.8
(8)
0.2
＋
x
=
1.7
x
=
1.7
−
0.2
x
=
1.5
x
=
1.5
(9)
1.9
−
1.3
x
=
4.37
−
1.3
x
=
4.37
−
1.9
−
1.3
x
=
2.47
x
=
−1.9
(10)
−1.6
x
−
(
−0.12
)
=
−
x
−1.6
x
＋
x
=
−0.12
−0.6
x
=
−0.12
x
=
0.2
(11)
−0.28
＋
0.6
x
=
1.3
x
0.6
x
−
1.3
x
=
0.28
−0.7
x
=
0.28
x
=
−0.4
(12)
−2.53
＋
0.9
x
=
−1.4
x
0.9
x
＋
1.4
x
=
2.53
2.3
x
=
2.53
x
=
1.1
(13)
1.6
x
−
(
−3.4
)
=
−1.8
x
1.6
x
＋
1.8
x
=
−3.4
3.4
x
=
−3.4
x
=
−1
(14)
1.7
x
−
(
−4.08
)
=
−0.7
x
1.7
x
＋
0.7
x
=
−4.08
2.4
x
=
−4.08
x
=
−1.7