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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-10]
(1)
5.22
＋
(
−1.3
)
x
=
1.6
x
(2)
0.7
x
＋
(
−0.65
)
=
2
x
(3)
0.2
＋
1.6
x
=
2
x
(4)
1.4
x
＋
(
−1.2
)
=
−0.92
(5)
3.4
＋
(
−0.2
)
x
=
1.8
x
(6)
−0.4
x
−
(
−1.8
)
=
1.4
(7)
1.3
x
−
(
−2.24
)
=
−1.9
x
(8)
−1.4
x
−
2.4
=
−0.2
x
(9)
2.55
＋
(
−1.7
)
x
=
−0.2
x
(10)
−1.8
x
−
1.5
=
0.12
(11)
−1.2
x
−
0.8
=
−1.4
(12)
1.6
x
−
1.6
=
−2.24
(13)
0.27
＋
(
−0.1
)
x
=
−0.4
x
(14)
−0.9
x
−
0.36
=
−1.2
x
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
5.22
＋
(
−1.3
)
x
=
1.6
x
−1.3
x
−
1.6
x
=
−
5.22
−2.9
x
=
−5.22
x
=
1.8
(2)
0.7
x
＋
(
−0.65
)
=
2
x
0.7
x
−
2
x
=
0.65
−1.3
x
=
0.65
x
=
−0.5
(3)
0.2
＋
1.6
x
=
2
x
1.6
x
−
2
x
=
−
0.2
−0.4
x
=
−0.2
x
=
0.5
(4)
1.4
x
＋
(
−1.2
)
=
−0.92
1.4
x
=
−0.92
＋
1.2
1.4
x
=
0.28
x
=
0.2
(5)
3.4
＋
(
−0.2
)
x
=
1.8
x
−0.2
x
−
1.8
x
=
−
3.4
−2
x
=
−3.4
x
=
1.7
(6)
−0.4
x
−
(
−1.8
)
=
1.4
−0.4
x
=
1.4
−
1.8
−0.4
x
=
−0.4
x
=
1
(7)
1.3
x
−
(
−2.24
)
=
−1.9
x
1.3
x
＋
1.9
x
=
−2.24
3.2
x
=
−2.24
x
=
−0.7
(8)
−1.4
x
−
2.4
=
−0.2
x
−1.4
x
＋
0.2
x
=
2.4
−1.2
x
=
2.4
x
=
−2
(9)
2.55
＋
(
−1.7
)
x
=
−0.2
x
−1.7
x
＋
0.2
x
=
−
2.55
−1.5
x
=
−2.55
x
=
1.7
(10)
−1.8
x
−
1.5
=
0.12
−1.8
x
=
0.12
＋
1.5
−1.8
x
=
1.62
x
=
−0.9
(11)
−1.2
x
−
0.8
=
−1.4
−1.2
x
=
−1.4
＋
0.8
−1.2
x
=
−0.6
x
=
0.5
(12)
1.6
x
−
1.6
=
−2.24
1.6
x
=
−2.24
＋
1.6
1.6
x
=
−0.64
x
=
−0.4
(13)
0.27
＋
(
−0.1
)
x
=
−0.4
x
−0.1
x
＋
0.4
x
=
−
0.27
0.3
x
=
−0.27
x
=
−0.9
(14)
−0.9
x
−
0.36
=
−1.2
x
−0.9
x
＋
1.2
x
=
0.36
0.3
x
=
0.36
x
=
1.2