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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)
−0.9
−
1.1
x
=
−1.78
(2)
−1.3
x
＋
(
−1.8
)
=
−1.67
(3)
0.5
x
＋
0.48
=
0.2
x
(4)
0.7
x
＋
0.7
=
0.28
(5)
−1.5
−
1.6
x
=
−1.66
(6)
1.3
x
−
(
−1.2
)
=
0.5
x
(7)
−1.1
x
−
(
−0.88
)
=
−1.9
x
(8)
−0.2
＋
(
−0.4
)
x
=
−0.6
x
(9)
2
−
1.2
x
=
2.24
(10)
1.5
−
0.6
x
=
1.62
(11)
−0.8
＋
1.9
x
=
−3.84
(12)
1.5
x
＋
(
−0.54
)
=
0.9
x
(13)
−0.4
x
＋
1.3
=
0.6
x
(14)
−0.3
x
−
(
−0.7
)
=
0.13
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−0.9
−
1.1
x
=
−1.78
−
1.1
x
=
−1.78
＋
0.9
−
1.1
x
=
−0.88
x
=
0.8
(2)
−1.3
x
＋
(
−1.8
)
=
−1.67
−1.3
x
=
−1.67
＋
1.8
−1.3
x
=
0.13
x
=
−0.1
(3)
0.5
x
＋
0.48
=
0.2
x
0.5
x
−
0.2
x
=
−
0.48
0.3
x
=
−0.48
x
=
−1.6
(4)
0.7
x
＋
0.7
=
0.28
0.7
x
=
0.28
−
0.7
0.7
x
=
−0.42
x
=
−0.6
(5)
−1.5
−
1.6
x
=
−1.66
−
1.6
x
=
−1.66
＋
1.5
−
1.6
x
=
−0.16
x
=
0.1
(6)
1.3
x
−
(
−1.2
)
=
0.5
x
1.3
x
−
0.5
x
=
−1.2
0.8
x
=
−1.2
x
=
−1.5
(7)
−1.1
x
−
(
−0.88
)
=
−1.9
x
−1.1
x
＋
1.9
x
=
−0.88
0.8
x
=
−0.88
x
=
−1.1
(8)
−0.2
＋
(
−0.4
)
x
=
−0.6
x
−0.4
x
＋
0.6
x
=
0.2
0.2
x
=
0.2
x
=
1
(9)
2
−
1.2
x
=
2.24
−
1.2
x
=
2.24
−
2
−
1.2
x
=
0.24
x
=
−0.2
(10)
1.5
−
0.6
x
=
1.62
−
0.6
x
=
1.62
−
1.5
−
0.6
x
=
0.12
x
=
−0.2
(11)
−0.8
＋
1.9
x
=
−3.84
1.9
x
=
−3.84
＋
0.8
1.9
x
=
−3.04
x
=
−1.6
(12)
1.5
x
＋
(
−0.54
)
=
0.9
x
1.5
x
−
0.9
x
=
0.54
0.6
x
=
0.54
x
=
0.9
(13)
−0.4
x
＋
1.3
=
0.6
x
−0.4
x
−
0.6
x
=
−
1.3
−
x
=
−1.3
x
=
1.3
(14)
−0.3
x
−
(
−0.7
)
=
0.13
−0.3
x
=
0.13
−
0.7
−0.3
x
=
−0.57
x
=
1.9