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©2024 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-10]
(1)
0.7
＋
(
−1.2
)
x
=
1.78
(2)
−1.5
＋
0.4
x
=
−1.02
(3)
−0.1
x
−
(
−1.95
)
=
−1.4
x
(4)
1.8
x
＋
(
−1.44
)
=
x
(5)
−2.85
−
(
−0.6
)
x
=
−1.3
x
(6)
1
＋
(
−0.9
)
x
=
0.55
(7)
−0.9
＋
(
−0.3
)
x
=
1.5
x
(8)
−0.8
x
＋
0.38
=
−0.6
x
(9)
1.5
x
＋
(
−1.95
)
=
0.2
x
(10)
−0.3
x
＋
0.2
=
−0.4
(11)
−1.9
x
−
(
−0.8
)
=
0.04
(12)
0.8
x
−
(
−1.6
)
=
0.64
(13)
−0.1
x
＋
2.85
=
−2
x
(14)
−0.9
x
＋
0.12
=
−0.6
x
©2024 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
0.7
＋
(
−1.2
)
x
=
1.78
−1.2
x
=
1.78
−
0.7
−1.2
x
=
1.08
x
=
−0.9
(2)
−1.5
＋
0.4
x
=
−1.02
0.4
x
=
−1.02
＋
1.5
0.4
x
=
0.48
x
=
1.2
(3)
−0.1
x
−
(
−1.95
)
=
−1.4
x
−0.1
x
＋
1.4
x
=
−1.95
1.3
x
=
−1.95
x
=
−1.5
(4)
1.8
x
＋
(
−1.44
)
=
x
1.8
x
−
x
=
1.44
0.8
x
=
1.44
x
=
1.8
(5)
−2.85
−
(
−0.6
)
x
=
−1.3
x
0.6
x
＋
1.3
x
=
2.85
1.9
x
=
2.85
x
=
1.5
(6)
1
＋
(
−0.9
)
x
=
0.55
−0.9
x
=
0.55
−
1
−0.9
x
=
−0.45
x
=
0.5
(7)
−0.9
＋
(
−0.3
)
x
=
1.5
x
−0.3
x
−
1.5
x
=
0.9
−1.8
x
=
0.9
x
=
−0.5
(8)
−0.8
x
＋
0.38
=
−0.6
x
−0.8
x
＋
0.6
x
=
−
0.38
−0.2
x
=
−0.38
x
=
1.9
(9)
1.5
x
＋
(
−1.95
)
=
0.2
x
1.5
x
−
0.2
x
=
1.95
1.3
x
=
1.95
x
=
1.5
(10)
−0.3
x
＋
0.2
=
−0.4
−0.3
x
=
−0.4
−
0.2
−0.3
x
=
−0.6
x
=
2
(11)
−1.9
x
−
(
−0.8
)
=
0.04
−1.9
x
=
0.04
−
0.8
−1.9
x
=
−0.76
x
=
0.4
(12)
0.8
x
−
(
−1.6
)
=
0.64
0.8
x
=
0.64
−
1.6
0.8
x
=
−0.96
x
=
−1.2
(13)
−0.1
x
＋
2.85
=
−2
x
−0.1
x
＋
2
x
=
−
2.85
1.9
x
=
−2.85
x
=
−1.5
(14)
−0.9
x
＋
0.12
=
−0.6
x
−0.9
x
＋
0.6
x
=
−
0.12
−0.3
x
=
−0.12
x
=
0.4