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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)
−1.9
x
＋
(
−0.6
)
=
−1.36
(2)
−2.03
−
(
−1.5
)
x
=
−1.4
x
(3)
1.1
−
(
−1.1
)
x
=
−0.88
(4)
−2.16
＋
(
−2
)
x
=
−0.8
x
(5)
−1.7
＋
0.4
x
=
−1.1
(6)
0.2
x
−
1.5
=
−1.48
(7)
−1.1
＋
1.2
x
=
−2.3
(8)
1.2
x
＋
(
−2.2
)
=
0.1
x
(9)
−1.3
x
−
(
−1.2
)
=
1.98
(10)
1.5
−
1.9
x
=
−0.4
(11)
0.3
x
−
(
−0.63
)
=
−1.8
x
(12)
−1.9
x
＋
0.92
=
0.4
x
(13)
0.8
x
−
(
−0.08
)
=
x
(14)
−1.65
−
0.3
x
=
1.2
x
©2018 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−1.9
x
＋
(
−0.6
)
=
−1.36
−1.9
x
=
−1.36
＋
0.6
−1.9
x
=
−0.76
x
=
0.4
(2)
−2.03
−
(
−1.5
)
x
=
−1.4
x
1.5
x
＋
1.4
x
=
2.03
2.9
x
=
2.03
x
=
0.7
(3)
1.1
−
(
−1.1
)
x
=
−0.88
1.1
x
=
−0.88
−
1.1
1.1
x
=
−1.98
x
=
−1.8
(4)
−2.16
＋
(
−2
)
x
=
−0.8
x
−2
x
＋
0.8
x
=
2.16
−1.2
x
=
2.16
x
=
−1.8
(5)
−1.7
＋
0.4
x
=
−1.1
0.4
x
=
−1.1
＋
1.7
0.4
x
=
0.6
x
=
1.5
(6)
0.2
x
−
1.5
=
−1.48
0.2
x
=
−1.48
＋
1.5
0.2
x
=
0.02
x
=
0.1
(7)
−1.1
＋
1.2
x
=
−2.3
1.2
x
=
−2.3
＋
1.1
1.2
x
=
−1.2
x
=
−1
(8)
1.2
x
＋
(
−2.2
)
=
0.1
x
1.2
x
−
0.1
x
=
2.2
1.1
x
=
2.2
x
=
2
(9)
−1.3
x
−
(
−1.2
)
=
1.98
−1.3
x
=
1.98
−
1.2
−1.3
x
=
0.78
x
=
−0.6
(10)
1.5
−
1.9
x
=
−0.4
−
1.9
x
=
−0.4
−
1.5
−
1.9
x
=
−1.9
x
=
1
(11)
0.3
x
−
(
−0.63
)
=
−1.8
x
0.3
x
＋
1.8
x
=
−0.63
2.1
x
=
−0.63
x
=
−0.3
(12)
−1.9
x
＋
0.92
=
0.4
x
−1.9
x
−
0.4
x
=
−
0.92
−2.3
x
=
−0.92
x
=
0.4
(13)
0.8
x
−
(
−0.08
)
=
x
0.8
x
−
x
=
−0.08
−0.2
x
=
−0.08
x
=
0.4
(14)
−1.65
−
0.3
x
=
1.2
x
−
0.3
x
−
1.2
x
=
1.65
−1.5
x
=
1.65
x
=
−1.1