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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)
−2
＋
(
−1.7
)
x
=
−0.47
(2)
1.8
＋
(
−1.6
)
x
=
2.44
(3)
−1.7
＋
(
−1.3
)
x
=
−0.66
(4)
0.9
＋
(
−1.6
)
x
=
2.18
(5)
−0.08
−
(
−0.6
)
x
=
1.4
x
(6)
−0.3
x
−
(
−1.7
)
=
1.94
(7)
−1.4
−
(
−0.3
)
x
=
−1.1
(8)
−2
x
＋
(
−0.7
)
=
−0.5
(9)
−0.6
−
0.3
x
=
−0.45
(10)
2.28
−
(
−0.5
)
x
=
1.7
x
(11)
−1.6
＋
1.9
x
=
−2.55
(12)
−1
＋
(
−0.3
)
x
=
−1.3
(13)
−0.3
x
＋
(
−3.74
)
=
1.9
x
(14)
1.12
−
(
−1.3
)
x
=
−1.5
x
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
−2
＋
(
−1.7
)
x
=
−0.47
−1.7
x
=
−0.47
＋
2
−1.7
x
=
1.53
x
=
−0.9
(2)
1.8
＋
(
−1.6
)
x
=
2.44
−1.6
x
=
2.44
−
1.8
−1.6
x
=
0.64
x
=
−0.4
(3)
−1.7
＋
(
−1.3
)
x
=
−0.66
−1.3
x
=
−0.66
＋
1.7
−1.3
x
=
1.04
x
=
−0.8
(4)
0.9
＋
(
−1.6
)
x
=
2.18
−1.6
x
=
2.18
−
0.9
−1.6
x
=
1.28
x
=
−0.8
(5)
−0.08
−
(
−0.6
)
x
=
1.4
x
0.6
x
−
1.4
x
=
0.08
−0.8
x
=
0.08
x
=
−0.1
(6)
−0.3
x
−
(
−1.7
)
=
1.94
−0.3
x
=
1.94
−
1.7
−0.3
x
=
0.24
x
=
−0.8
(7)
−1.4
−
(
−0.3
)
x
=
−1.1
0.3
x
=
−1.1
＋
1.4
0.3
x
=
0.3
x
=
1
(8)
−2
x
＋
(
−0.7
)
=
−0.5
−2
x
=
−0.5
＋
0.7
−2
x
=
0.2
x
=
−0.1
(9)
−0.6
−
0.3
x
=
−0.45
−
0.3
x
=
−0.45
＋
0.6
−
0.3
x
=
0.15
x
=
−0.5
(10)
2.28
−
(
−0.5
)
x
=
1.7
x
0.5
x
−
1.7
x
=
−
2.28
−1.2
x
=
−2.28
x
=
1.9
(11)
−1.6
＋
1.9
x
=
−2.55
1.9
x
=
−2.55
＋
1.6
1.9
x
=
−0.95
x
=
−0.5
(12)
−1
＋
(
−0.3
)
x
=
−1.3
−0.3
x
=
−1.3
＋
1
−0.3
x
=
−0.3
x
=
1
(13)
−0.3
x
＋
(
−3.74
)
=
1.9
x
−0.3
x
−
1.9
x
=
3.74
−2.2
x
=
3.74
x
=
−1.7
(14)
1.12
−
(
−1.3
)
x
=
−1.5
x
1.3
x
＋
1.5
x
=
−
1.12
2.8
x
=
−1.12
x
=
−0.4