题目内容

递等式计算(能简便的要简便)
①(
3
8
+
5
6
)÷
1
24
②2.5×13×0.42③5.3×12-33.46÷0.35
8
9
÷[(
2
5
+
1
10
)×
3
4
]
⑤9.34-(2.34+0.49)
4
5
+
4
5
×19.
(1)(
3
8
+
5
6
)÷
1
24

=(
3
8
+
5
6
)×24,
=
3
8
×24+
5
6
×24,
=9+20,
=29;

(2)2.5×13×0.42,
=32.5×0.42,
=16.65;

(3)5.3×12-33.46÷0.35,
=63.6-95.6,
=-32;

(4)
8
9
÷[(
2
5
+
1
10
)×
3
4
],
=
8
9
÷[
1
2
×
3
4
],
=
8
9
×
8
3

=
64
27


(5)9.34-(2.34+0.49),
=9.34-2.34-0.49,
=7-0.49,
=6.51;

(6)
4
5
+
4
5
×19,
=
4
5
×(1+19),
=
4
5
×20,
=16.
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