题目内容

用递等式计算.
(1)(3618÷18-145)×20
(2)16.8-45÷0.9×0.16
(3)
4
9
×
3
20
+
11
15
÷22
(4)96÷[(
5
6
-
3
4
)×2.4+
3
5
].
(1)(3618÷18-145)×20,
=(201-145)×20,
=56×20,
=1120

(2)16.8-45÷0.9×0.16,
=16.8-50×0.16,
=16.8-8,
=8.8;

(3)
4
9
×
3
20
+
11
15
÷22,
=
1
15
+
11
15
÷22,
=
1
15
+
1
30

=
1
10


(4)96÷[(
5
6
-
3
4
)×2.4+
3
5
],
=96÷[
1
12
×2.4+
3
5
],
=96÷[
1
5
+
3
5
],
=96÷
4
5

=120.
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