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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)
−0.4
x
−
1.9
=
−1.1
(2)
1.6
＋
1.3
x
=
−0.3
x
(3)
1.8
x
＋
(
−4.64
)
=
−1.1
x
(4)
−0.7
x
＋
0.5
=
−0.48
(5)
−0.9
x
−
0.8
=
−2.42
(6)
0.36
−
(
−1.8
)
x
=
1.6
x
(7)
1.1
x
−
(
−0.8
)
=
0.14
(8)
0.48
−
(
−0.8
)
x
=
−0.4
x
(9)
−2
−
1.7
x
=
−5.06
(10)
−1.26
＋
(
−0.7
)
x
=
0.2
x
(11)
−3.91
＋
(
−1.3
)
x
=
x
(12)
2.8
＋
(
−0.9
)
x
=
1.1
x
(13)
0.2
−
(
−0.4
)
x
=
0
(14)
−1.9
x
−
(
−3.7
)
=
1.8
x
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−0.4
x
−
1.9
=
−1.1
−0.4
x
=
−1.1
＋
1.9
−0.4
x
=
0.8
x
=
−2
(2)
1.6
＋
1.3
x
=
−0.3
x
1.3
x
＋
0.3
x
=
−
1.6
1.6
x
=
−1.6
x
=
−1
(3)
1.8
x
＋
(
−4.64
)
=
−1.1
x
1.8
x
＋
1.1
x
=
4.64
2.9
x
=
4.64
x
=
1.6
(4)
−0.7
x
＋
0.5
=
−0.48
−0.7
x
=
−0.48
−
0.5
−0.7
x
=
−0.98
x
=
1.4
(5)
−0.9
x
−
0.8
=
−2.42
−0.9
x
=
−2.42
＋
0.8
−0.9
x
=
−1.62
x
=
1.8
(6)
0.36
−
(
−1.8
)
x
=
1.6
x
1.8
x
−
1.6
x
=
−
0.36
0.2
x
=
−0.36
x
=
−1.8
(7)
1.1
x
−
(
−0.8
)
=
0.14
1.1
x
=
0.14
−
0.8
1.1
x
=
−0.66
x
=
−0.6
(8)
0.48
−
(
−0.8
)
x
=
−0.4
x
0.8
x
＋
0.4
x
=
−
0.48
1.2
x
=
−0.48
x
=
−0.4
(9)
−2
−
1.7
x
=
−5.06
−
1.7
x
=
−5.06
＋
2
−
1.7
x
=
−3.06
x
=
1.8
(10)
−1.26
＋
(
−0.7
)
x
=
0.2
x
−0.7
x
−
0.2
x
=
1.26
−0.9
x
=
1.26
x
=
−1.4
(11)
−3.91
＋
(
−1.3
)
x
=
x
−1.3
x
−
x
=
3.91
−2.3
x
=
3.91
x
=
−1.7
(12)
2.8
＋
(
−0.9
)
x
=
1.1
x
−0.9
x
−
1.1
x
=
−
2.8
−2
x
=
−2.8
x
=
1.4
(13)
0.2
−
(
−0.4
)
x
=
0
0.4
x
=
−
0.2
0.4
x
=
−0.2
x
=
−0.5
(14)
−1.9
x
−
(
−3.7
)
=
1.8
x
−1.9
x
−
1.8
x
=
−3.7
−3.7
x
=
−3.7
x
=
1