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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)
0.2
−
(
−1.3
)
x
=
−1.88
(2)
1.3
x
＋
1.3
=
−0.52
(3)
−0.3
＋
1.2
x
=
−0.3
x
(4)
−0.8
x
−
(
−0.4
)
=
1.44
(5)
2.16
−
(
−0.1
)
x
=
1.3
x
(6)
0.54
−
0.4
x
=
0.2
x
(7)
−0.84
＋
(
−0.3
)
x
=
1.8
x
(8)
1.3
x
＋
(
−1
)
=
−1.52
(9)
−1.08
−
0.5
x
=
1.3
x
(10)
−0.4
−
(
−0.5
)
x
=
−0.1
(11)
−0.4
x
＋
(
−0.2
)
=
−0.36
(12)
−1.9
x
−
0.44
=
−1.5
x
(13)
−1.2
x
＋
(
−0.1
)
=
−0.46
(14)
−1
−
(
−1.3
)
x
=
−3.21
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
0.2
−
(
−1.3
)
x
=
−1.88
1.3
x
=
−1.88
−
0.2
1.3
x
=
−2.08
x
=
−1.6
(2)
1.3
x
＋
1.3
=
−0.52
1.3
x
=
−0.52
−
1.3
1.3
x
=
−1.82
x
=
−1.4
(3)
−0.3
＋
1.2
x
=
−0.3
x
1.2
x
＋
0.3
x
=
0.3
1.5
x
=
0.3
x
=
0.2
(4)
−0.8
x
−
(
−0.4
)
=
1.44
−0.8
x
=
1.44
−
0.4
−0.8
x
=
1.04
x
=
−1.3
(5)
2.16
−
(
−0.1
)
x
=
1.3
x
0.1
x
−
1.3
x
=
−
2.16
−1.2
x
=
−2.16
x
=
1.8
(6)
0.54
−
0.4
x
=
0.2
x
−
0.4
x
−
0.2
x
=
−
0.54
−0.6
x
=
−0.54
x
=
0.9
(7)
−0.84
＋
(
−0.3
)
x
=
1.8
x
−0.3
x
−
1.8
x
=
0.84
−2.1
x
=
0.84
x
=
−0.4
(8)
1.3
x
＋
(
−1
)
=
−1.52
1.3
x
=
−1.52
＋
1
1.3
x
=
−0.52
x
=
−0.4
(9)
−1.08
−
0.5
x
=
1.3
x
−
0.5
x
−
1.3
x
=
1.08
−1.8
x
=
1.08
x
=
−0.6
(10)
−0.4
−
(
−0.5
)
x
=
−0.1
0.5
x
=
−0.1
＋
0.4
0.5
x
=
0.3
x
=
0.6
(11)
−0.4
x
＋
(
−0.2
)
=
−0.36
−0.4
x
=
−0.36
＋
0.2
−0.4
x
=
−0.16
x
=
0.4
(12)
−1.9
x
−
0.44
=
−1.5
x
−1.9
x
＋
1.5
x
=
0.44
−0.4
x
=
0.44
x
=
−1.1
(13)
−1.2
x
＋
(
−0.1
)
=
−0.46
−1.2
x
=
−0.46
＋
0.1
−1.2
x
=
−0.36
x
=
0.3
(14)
−1
−
(
−1.3
)
x
=
−3.21
1.3
x
=
−3.21
＋
1
1.3
x
=
−2.21
x
=
−1.7