题目内容

怎样算简便就怎样算.
5
18
+
13
18
×9
(5.6-1.6÷2)×2.5
1
8
÷[
1
25
×(
2
5
+
1
10
)].
(1)9×
5
18
+
13
18
×9,
=(
5
18
+
13
18
)×9,
=1×9,
=9;
(2)(5.6-1.6÷2)×2.5,
=(5.6-0.8)×2.5,
=4.8×2.5,
=12;
(3)
1
8
÷[
1
25
×(
2
5
+
1
10
)],
=
1
8
÷[
1
25
×
1
2
],
=
1
8
×50,
=6.25.
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