题目内容

你认为怎样算简便就怎样算.
①(
1
6
+
1
5
)÷(
7
8
-
5
12

②[19.8-(4.9+9.8)]×(1÷0.01)
③155×360×77÷90÷11÷31
④1÷28×72-27×
1
28
-17÷28.
①(
1
6
+
1
5
)÷(
7
8
-
5
12
),
=
11
30
÷
11
24

=
11
30
×
24
11

=
4
5


②[19.8-(4.9+9.8)]×(1÷0.01),
=[19.8-14.7]×100,
=5.1×100,
=510;

③155×360×77÷90÷11÷31,
=(155÷31)×(360÷90)×(77÷11),
=5×4×7,
=140;

④1÷28×72-27×
1
28
-17÷28,
=
1
28
×
72-27×
1
28
-17×
1
28

=
1
28
×
(72-27-17),
=
1
28
×
28,
=1.
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