问题 解答题
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
)].
答案

(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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