题目内容

(54+
9
13
)÷9
105×13-1890÷1836÷[(
5
6
-
1
3
)×3]
9.25×9.9+92.5%258×852852-852×258258.
(1)(54+
9
13
)÷9,
=(54+
9
13
)×
1
9

=54×
1
9
+
9
13
×
1
9

=6+
1
13

=6
1
13


(2)105×13-1890÷18,
=1365-105,
=1260;

(3)36÷[(
5
6
-
1
3
)×3],
=36÷[
5
6
×3-
1
3
×3],
=36÷
3
2

=24;

(4)9.25×9.9+92.5%,
=0.925×99+0.925,
=0.925×(99+1),
=0.925×100,
=92.5;

(5)258×852852-852×258258,
=258×852×1001-852×258×1001,
=0.
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