题目内容

计算下面各题.(能够简便计算的要求简便计算)
①730-240÷15×16                   
②
7
9
×
5
11
+
2
9
×
5
11

③
3
4
+
3
4
×3                           
④[1一(
1
2
-
1
4
)]×
2
3
.
①730-240÷15×16,
=730-16×16,
=730-256,
=474;

②
7
9
×
5
11
+
2
9
×
5
11
,
=(
7
9
+
2
9
)×
5
11
,
=1×
5
11
,
=
5
11
;

③
3
4
+
3
4
×3,
=
3
4
×(1+3),
=
3
4
×4,
=3;

 ④[1一(
1
2
-
1
4
)]×
2
3
,
=[1-
1
4
]×
2
3
,
=
3
4
×
2
3
,
=
1
2
.
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