题目内容

(1)(
2
5
+
5
8
)÷
3
5
+
2
3
=______;
(2)若
1
2
x=52×50%+
8
15
x,则x=______.
(1)(
2
5
+
5
8
)÷
3
5
+
2
3

=
41
40
÷
3
5
+
2
3

=
41
40
×
5
3
+
2
3

=
41
24
+
16
24

=
57
24

=2
3
8


(2)若
1
2
x=52×50%+
8
15
x,
1
2
x=52×0.5+
8
15
x,
1
2
x-
8
15
x=26,
-
1
30
x=26,
-
1
30
x×30=26×30,
x=-780;
故答案为:2
3
8
,-780.
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