> 数学 >
解方程.
2x-
2
3
=
1
3

x-(
1
4
+
1
5
)=
1
20
人气:426 ℃ 时间:2020-04-14 01:08:39
解答

(1)2x-
2
3
=
1
3

  2x-
2
3
+
2
3
=
1
3
+
2
3

        2x=1,
     2x÷2=1÷2,
         x=0.5;
(2)x-(
1
4
+
1
5
)=
1
20

            x-
9
20
=
1
20

        x-
9
20
+
9
20
=
1
20
+
9
20

                x=
1
2
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