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![](https://files.manualsfile.com/bgl252000-04/bg67.png)
ïðï
*
18
(a.
(b.
ÿ
:
.
.
ÿ
:
.
19
.
.
.
20
.
.
. max
.
25
.
21
.
22
.
23
.
.
.
.
.
24
.
ÿ
:
.
.
(b) (a)
:
25
.
. (b + a)
26
24 (b + a)
.
.
.
ÿ
:
. (a) (b) .
27
21
.
.
19
.
.
ÿ
:
.(
26
+
25
)
.
28
21
.
.
.
.
. 24
.
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