[文字サイズの変更]
▼
▲
©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[0E5-30]
(1)
8
(
−1.4
x
+
1.6
)
=
91.2
(2)
5
(
−0.3
x
−
7
)
=
−32.75
(3)
−3
(
−1.2
x
−
9
)
=
16.2
(4)
7
8
71
5
(
x
+
)
=
8
5
8
(5)
100
−4
(
1.6
x
−
7
)
=
3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
8
(
−1.4
x
+
1.6
)
=
91.2
−11.2
x
+
12.8
=
91.2
−11.2
x
=
91.2
−
12.8
x
=
−7
(2)
5
(
−0.3
x
−
7
)
=
−32.75
−1.5
x
−
35
=
−32.75
−1.5
x
=
−32.75
+
35
x
=
−1.5
(3)
−3
(
−1.2
x
−
9
)
=
16.2
3.6
x
+
27
=
16.2
3.6
x
=
16.2
−
27
x
=
−3
(4)
7
8
71
5
(
x
+
)
=
8
5
8
35
x
+
8
8
71
=
8
35
x
8
71
=
−
8
8
x
1
=
5
(5)
100
−4
(
1.6
x
−
7
)
=
3
−6.4
x
+
28
100
=
3
−6.4
x
100
=
−
28
3
x
5
=
−
6