题目内容

用递等式计算下列各题.
496+250×16

10.2-(1.25+2.5)÷1.5

3
7
÷
5
6
+
4
7
×
6
5

9
20
÷[
3
4
×(
2
5
+
1
3
)]
(1)496+250×16,
=496+250×4×4,
=496+1000×4,
=496+4000,
=4496;

(2)10.2-(1.25+2.5)÷1.5,
=10.2-3.75÷1.5,
=10.2-2.5,
=7.7;

(3)
3
7
÷
5
6
+
4
7
×
6
5

=
3
7
×
6
5
+
4
7
×
6
5

=(
3
7
+
4
7
)×
6
5

=1×
6
5

=
6
5


(4)
9
20
÷[
3
4
×(
2
5
+
1
3
)]

=
9
20
÷[
3
4
×
11
15
],
=
9
20
÷
11
20

=
9
11
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