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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-10]
(1)
1.7
x
＋
1.74
=
−1.2
x
(2)
−0.32
−
(
−1.9
)
x
=
1.5
x
(3)
−0.8
x
−
2.1
=
0.6
x
(4)
0.8
x
−
(
−1.5
)
=
0.7
(5)
−1.3
＋
(
−0.3
)
x
=
x
(6)
1.92
−
0.5
x
=
0.7
x
(7)
1.1
x
＋
2.24
=
−1.7
x
(8)
−0.2
−
(
−1.3
)
x
=
−0.07
(9)
−0.78
−
x
=
−0.4
x
(10)
−0.3
x
＋
(
−2.8
)
=
1.1
x
(11)
0.54
−
(
−0.6
)
x
=
1.2
x
(12)
−0.4
−
(
−0.1
)
x
=
0.5
x
(13)
0.56
−
x
=
−0.3
x
(14)
0.2
x
＋
(
−1.4
)
=
−1.02
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
1.7
x
＋
1.74
=
−1.2
x
1.7
x
＋
1.2
x
=
−
1.74
2.9
x
=
−1.74
x
=
−0.6
(2)
−0.32
−
(
−1.9
)
x
=
1.5
x
1.9
x
−
1.5
x
=
0.32
0.4
x
=
0.32
x
=
0.8
(3)
−0.8
x
−
2.1
=
0.6
x
−0.8
x
−
0.6
x
=
2.1
−1.4
x
=
2.1
x
=
−1.5
(4)
0.8
x
−
(
−1.5
)
=
0.7
0.8
x
=
0.7
−
1.5
0.8
x
=
−0.8
x
=
−1
(5)
−1.3
＋
(
−0.3
)
x
=
x
−0.3
x
−
x
=
1.3
−1.3
x
=
1.3
x
=
−1
(6)
1.92
−
0.5
x
=
0.7
x
−
0.5
x
−
0.7
x
=
−
1.92
−1.2
x
=
−1.92
x
=
1.6
(7)
1.1
x
＋
2.24
=
−1.7
x
1.1
x
＋
1.7
x
=
−
2.24
2.8
x
=
−2.24
x
=
−0.8
(8)
−0.2
−
(
−1.3
)
x
=
−0.07
1.3
x
=
−0.07
＋
0.2
1.3
x
=
0.13
x
=
0.1
(9)
−0.78
−
x
=
−0.4
x
−
x
＋
0.4
x
=
0.78
−0.6
x
=
0.78
x
=
−1.3
(10)
−0.3
x
＋
(
−2.8
)
=
1.1
x
−0.3
x
−
1.1
x
=
2.8
−1.4
x
=
2.8
x
=
−2
(11)
0.54
−
(
−0.6
)
x
=
1.2
x
0.6
x
−
1.2
x
=
−
0.54
−0.6
x
=
−0.54
x
=
0.9
(12)
−0.4
−
(
−0.1
)
x
=
0.5
x
0.1
x
−
0.5
x
=
0.4
−0.4
x
=
0.4
x
=
−1
(13)
0.56
−
x
=
−0.3
x
−
x
＋
0.3
x
=
−
0.56
−0.7
x
=
−0.56
x
=
0.8
(14)
0.2
x
＋
(
−1.4
)
=
−1.02
0.2
x
=
−1.02
＋
1.4
0.2
x
=
0.38
x
=
1.9