Question

4/x=0.2+5/x咋解方程

Answer 1

(x
-
4)/0.2
=
5(x
+
2)/(x
+
3)
(x
-
4)(x +
3)
=
x
+
2
x²
-
x
-
12
=
x
+
2
x²
-
2x
+
1
=
15
(x
-
1)²
=
15
x
=
1
±√15
经检验x
=
1
±√15均为原方程的根。