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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
＋
1.36
=
−0.4
x
(2)
−
x
−
(
−0.4
)
=
−1.5
(3)
1.9
x
＋
(
−0.07
)
=
1.8
x
(4)
−1.3
x
−
1.3
=
−3.51
(5)
0.8
＋
1.5
x
=
−2.05
(6)
−2.9
＋
2
x
=
−0.9
x
(7)
0.7
＋
1.2
x
=
2.74
(8)
−1.4
x
＋
(
−0.64
)
=
−1.8
x
(9)
1.6
x
−
(
−1.5
)
=
4.54
(10)
1.1
−
(
−0.9
)
x
=
−0.34
(11)
1.89
−
(
−0.8
)
x
=
−1.9
x
(12)
1.3
x
−
0.6
=
x
(13)
1.3
＋
(
−1.9
)
x
=
1.11
(14)
2
−
(
−0.3
)
x
=
1.85
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
0.4
x
＋
1.36
=
−0.4
x
0.4
x
＋
0.4
x
=
−
1.36
0.8
x
=
−1.36
x
=
−1.7
(2)
−
x
−
(
−0.4
)
=
−1.5
−
x
=
−1.5
−
0.4
−
x
=
−1.9
x
=
1.9
(3)
1.9
x
＋
(
−0.07
)
=
1.8
x
1.9
x
−
1.8
x
=
0.07
0.1
x
=
0.07
x
=
0.7
(4)
−1.3
x
−
1.3
=
−3.51
−1.3
x
=
−3.51
＋
1.3
−1.3
x
=
−2.21
x
=
1.7
(5)
0.8
＋
1.5
x
=
−2.05
1.5
x
=
−2.05
−
0.8
1.5
x
=
−2.85
x
=
−1.9
(6)
−2.9
＋
2
x
=
−0.9
x
2
x
＋
0.9
x
=
2.9
2.9
x
=
2.9
x
=
1
(7)
0.7
＋
1.2
x
=
2.74
1.2
x
=
2.74
−
0.7
1.2
x
=
2.04
x
=
1.7
(8)
−1.4
x
＋
(
−0.64
)
=
−1.8
x
−1.4
x
＋
1.8
x
=
0.64
0.4
x
=
0.64
x
=
1.6
(9)
1.6
x
−
(
−1.5
)
=
4.54
1.6
x
=
4.54
−
1.5
1.6
x
=
3.04
x
=
1.9
(10)
1.1
−
(
−0.9
)
x
=
−0.34
0.9
x
=
−0.34
−
1.1
0.9
x
=
−1.44
x
=
−1.6
(11)
1.89
−
(
−0.8
)
x
=
−1.9
x
0.8
x
＋
1.9
x
=
−
1.89
2.7
x
=
−1.89
x
=
−0.7
(12)
1.3
x
−
0.6
=
x
1.3
x
−
x
=
0.6
0.3
x
=
0.6
x
=
2
(13)
1.3
＋
(
−1.9
)
x
=
1.11
−1.9
x
=
1.11
−
1.3
−1.9
x
=
−0.19
x
=
0.1
(14)
2
−
(
−0.3
)
x
=
1.85
0.3
x
=
1.85
−
2
0.3
x
=
−0.15
x
=
−0.5