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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
[0E3-10]
(1)
1.8
x
+
2
=
3.56
−
0.8
x
(2)
0.8
+
1.5
x
=
1.1
x
+
0.4
(3)
−1.2
x
+
0.6
=
−1
−
0.2
x
(4)
0.7
x
+
1.3
=
1.08
−
1.5
x
(5)
1.1
−
1.8
x
=
−1.4
x
+
1.34
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1.8
x
+
2
=
3.56
−
0.8
x
1.8
x
+
0.8
x
=
3.56
−
2
x
=
1.56
÷
2.6
x
=
0.6
(2)
0.8
+
1.5
x
=
1.1
x
+
0.4
1.5
x
−
1.1
x
=
0.4
−
0.8
x
=
−0.4
÷
0.4
x
=
−1
(3)
−1.2
x
+
0.6
=
−1
−
0.2
x
−1.2
x
+
0.2
x
=
−1
−
0.6
x
=
−1.6
÷
(
−1
)
x
=
1.6
(4)
0.7
x
+
1.3
=
1.08
−
1.5
x
0.7
x
+
1.5
x
=
1.08
−
1.3
x
=
−0.22
÷
2.2
x
=
−0.1
(5)
1.1
−
1.8
x
=
−1.4
x
+
1.34
−1.8
x
+
1.4
x
=
1.34
−
1.1
x
=
0.24
÷
(
−0.4
)
x
=
−0.6