［文字サイズの変更］
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©2018 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-10]
(1)
1.8
x
−
0.4
=
0.8
x
(2)
1.2
x
−
(
−0.3
)
=
1.26
(3)
2
−
0.5
x
=
1.3
(4)
−1.26
−
(
−0.2
)
x
=
−1.2
x
(5)
−1.3
x
＋
(
−0.6
)
=
1.48
(6)
1.1
＋
(
−1.3
)
x
=
0.71
(7)
−0.7
x
−
(
−0.55
)
=
−0.2
x
(8)
−0.36
−
0.5
x
=
−0.9
x
(9)
0.12
−
(
−0.8
)
x
=
1.4
x
(10)
1.1
−
1.2
x
=
−0.82
(11)
−0.6
−
0.6
x
=
−1.8
(12)
−0.3
−
(
−0.6
)
x
=
−0.84
(13)
0.13
＋
1.7
x
=
1.6
x
(14)
−0.3
x
−
(
−0.7
)
=
−0.8
x
©2018 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
1.8
x
−
0.4
=
0.8
x
1.8
x
−
0.8
x
=
0.4
x
=
0.4
(2)
1.2
x
−
(
−0.3
)
=
1.26
1.2
x
=
1.26
−
0.3
1.2
x
=
0.96
x
=
0.8
(3)
2
−
0.5
x
=
1.3
−
0.5
x
=
1.3
−
2
−
0.5
x
=
−0.7
x
=
1.4
(4)
−1.26
−
(
−0.2
)
x
=
−1.2
x
0.2
x
＋
1.2
x
=
1.26
1.4
x
=
1.26
x
=
0.9
(5)
−1.3
x
＋
(
−0.6
)
=
1.48
−1.3
x
=
1.48
＋
0.6
−1.3
x
=
2.08
x
=
−1.6
(6)
1.1
＋
(
−1.3
)
x
=
0.71
−1.3
x
=
0.71
−
1.1
−1.3
x
=
−0.39
x
=
0.3
(7)
−0.7
x
−
(
−0.55
)
=
−0.2
x
−0.7
x
＋
0.2
x
=
−0.55
−0.5
x
=
−0.55
x
=
1.1
(8)
−0.36
−
0.5
x
=
−0.9
x
−
0.5
x
＋
0.9
x
=
0.36
0.4
x
=
0.36
x
=
0.9
(9)
0.12
−
(
−0.8
)
x
=
1.4
x
0.8
x
−
1.4
x
=
−
0.12
−0.6
x
=
−0.12
x
=
0.2
(10)
1.1
−
1.2
x
=
−0.82
−
1.2
x
=
−0.82
−
1.1
−
1.2
x
=
−1.92
x
=
1.6
(11)
−0.6
−
0.6
x
=
−1.8
−
0.6
x
=
−1.8
＋
0.6
−
0.6
x
=
−1.2
x
=
2
(12)
−0.3
−
(
−0.6
)
x
=
−0.84
0.6
x
=
−0.84
＋
0.3
0.6
x
=
−0.54
x
=
−0.9
(13)
0.13
＋
1.7
x
=
1.6
x
1.7
x
−
1.6
x
=
−
0.13
0.1
x
=
−0.13
x
=
−1.3
(14)
−0.3
x
−
(
−0.7
)
=
−0.8
x
−0.3
x
＋
0.8
x
=
−0.7
0.5
x
=
−0.7
x
=
−1.4