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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)
0.9
x
−
(
−1.9
)
=
2.71
(2)
−0.2
＋
(
−1.6
)
x
=
1.88
(3)
−0.9
＋
1.1
x
=
−1.12
(4)
−1.8
−
1.1
x
=
−0.26
(5)
1.4
＋
(
−1.6
)
x
=
1.9
x
(6)
−0.13
−
(
−2
)
x
=
1.9
x
(7)
−1.3
x
＋
(
−0.7
)
=
0.73
(8)
−1.1
x
−
0.48
=
−1.4
x
(9)
0.7
x
＋
1.3
=
1.02
(10)
−0.9
＋
(
−1.8
)
x
=
0
(11)
−0.9
x
＋
(
−0.8
)
=
−1.16
(12)
1.9
x
＋
2.24
=
0.3
x
(13)
−0.1
x
−
0.4
=
−0.24
(14)
−0.34
−
0.4
x
=
−0.2
x
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
0.9
x
−
(
−1.9
)
=
2.71
0.9
x
=
2.71
−
1.9
0.9
x
=
0.81
x
=
0.9
(2)
−0.2
＋
(
−1.6
)
x
=
1.88
−1.6
x
=
1.88
＋
0.2
−1.6
x
=
2.08
x
=
−1.3
(3)
−0.9
＋
1.1
x
=
−1.12
1.1
x
=
−1.12
＋
0.9
1.1
x
=
−0.22
x
=
−0.2
(4)
−1.8
−
1.1
x
=
−0.26
−
1.1
x
=
−0.26
＋
1.8
−
1.1
x
=
1.54
x
=
−1.4
(5)
1.4
＋
(
−1.6
)
x
=
1.9
x
−1.6
x
−
1.9
x
=
−
1.4
−3.5
x
=
−1.4
x
=
0.4
(6)
−0.13
−
(
−2
)
x
=
1.9
x
2
x
−
1.9
x
=
0.13
0.1
x
=
0.13
x
=
1.3
(7)
−1.3
x
＋
(
−0.7
)
=
0.73
−1.3
x
=
0.73
＋
0.7
−1.3
x
=
1.43
x
=
−1.1
(8)
−1.1
x
−
0.48
=
−1.4
x
−1.1
x
＋
1.4
x
=
0.48
0.3
x
=
0.48
x
=
1.6
(9)
0.7
x
＋
1.3
=
1.02
0.7
x
=
1.02
−
1.3
0.7
x
=
−0.28
x
=
−0.4
(10)
−0.9
＋
(
−1.8
)
x
=
0
−1.8
x
=
0.9
−1.8
x
=
0.9
x
=
−0.5
(11)
−0.9
x
＋
(
−0.8
)
=
−1.16
−0.9
x
=
−1.16
＋
0.8
−0.9
x
=
−0.36
x
=
0.4
(12)
1.9
x
＋
2.24
=
0.3
x
1.9
x
−
0.3
x
=
−
2.24
1.6
x
=
−2.24
x
=
−1.4
(13)
−0.1
x
−
0.4
=
−0.24
−0.1
x
=
−0.24
＋
0.4
−0.1
x
=
0.16
x
=
−1.6
(14)
−0.34
−
0.4
x
=
−0.2
x
−
0.4
x
＋
0.2
x
=
0.34
−0.2
x
=
0.34
x
=
−1.7