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

3
4
+
3
4
×3                           
④[1一(
1
2
-
1
4
)]×
2
3
答案

①730-240÷15×16,

=730-16×16,

=730-256,

=474;

7
9
×
5
11
+
2
9
×
5
11

=(

7
9
+
2
9
)×
5
11

=1×

5
11

=

5
11

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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