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©2019 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
−
2
=
−4.16
(2)
−0.8
x
−
0.42
=
−0.1
x
(3)
−3.84
＋
2
x
=
−1.2
x
(4)
−1.6
x
−
1.8
=
−3.24
(5)
−
x
＋
1.2
=
−0.4
x
(6)
−0.4
＋
(
−1.7
)
x
=
−0.06
(7)
1.7
−
0.7
x
=
2.47
(8)
−0.8
−
(
−0.5
)
x
=
−1.3
(9)
−1.8
−
0.9
x
=
−2.88
(10)
−0.2
x
＋
(
−1.9
)
=
−2.2
(11)
0.7
x
＋
(
−2
)
=
−3.33
(12)
2
x
−
(
−0.3
)
=
−
x
(13)
2
x
＋
2.86
=
−0.6
x
(14)
−1.19
＋
(
−1.5
)
x
=
−0.8
x
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−1.8
x
−
2
=
−4.16
−1.8
x
=
−4.16
＋
2
−1.8
x
=
−2.16
x
=
1.2
(2)
−0.8
x
−
0.42
=
−0.1
x
−0.8
x
＋
0.1
x
=
0.42
−0.7
x
=
0.42
x
=
−0.6
(3)
−3.84
＋
2
x
=
−1.2
x
2
x
＋
1.2
x
=
3.84
3.2
x
=
3.84
x
=
1.2
(4)
−1.6
x
−
1.8
=
−3.24
−1.6
x
=
−3.24
＋
1.8
−1.6
x
=
−1.44
x
=
0.9
(5)
−
x
＋
1.2
=
−0.4
x
−
x
＋
0.4
x
=
−
1.2
−0.6
x
=
−1.2
x
=
2
(6)
−0.4
＋
(
−1.7
)
x
=
−0.06
−1.7
x
=
−0.06
＋
0.4
−1.7
x
=
0.34
x
=
−0.2
(7)
1.7
−
0.7
x
=
2.47
−
0.7
x
=
2.47
−
1.7
−
0.7
x
=
0.77
x
=
−1.1
(8)
−0.8
−
(
−0.5
)
x
=
−1.3
0.5
x
=
−1.3
＋
0.8
0.5
x
=
−0.5
x
=
−1
(9)
−1.8
−
0.9
x
=
−2.88
−
0.9
x
=
−2.88
＋
1.8
−
0.9
x
=
−1.08
x
=
1.2
(10)
−0.2
x
＋
(
−1.9
)
=
−2.2
−0.2
x
=
−2.2
＋
1.9
−0.2
x
=
−0.3
x
=
1.5
(11)
0.7
x
＋
(
−2
)
=
−3.33
0.7
x
=
−3.33
＋
2
0.7
x
=
−1.33
x
=
−1.9
(12)
2
x
−
(
−0.3
)
=
−
x
2
x
＋
x
=
−0.3
3
x
=
−0.3
x
=
−0.1
(13)
2
x
＋
2.86
=
−0.6
x
2
x
＋
0.6
x
=
−
2.86
2.6
x
=
−2.86
x
=
−1.1
(14)
−1.19
＋
(
−1.5
)
x
=
−0.8
x
−1.5
x
＋
0.8
x
=
1.19
−0.7
x
=
1.19
x
=
−1.7