早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算下面各题.(能够简便计算的要求简便计算)①730-240÷15×16②79×511+29×511③34+34×3④[1一(12-14)]×23.

题目详情
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


7
9
×
5
11
+
2
9
×
5
11

3
4
+
3
4
×3                           
④[1一(
1
2
-
1
4
)]×
2
3
7
9
7799
5
11
551111
2
9
2299
5
11
551111
3
4
+
3
4
×3                           
④[1一(
1
2
-
1
4
)]×
2
3
3
4
3344
3
4
×3                           
④[1一(
1
2
-
1
4
)]×
2
3
3
4
3344
1
2
-
1
4
)]×
2
3
1
2
1122
1
4
)]×
2
3
1
4
1144
2
3
2
3
2233
▼优质解答
答案和解析
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
7
9
777999×
5
11
555111111+
2
9
222999×
5
11
555111111,
=(
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
7
9
777999+
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
2
9
222999)×
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
5
11
555111111,
=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
5
11
555111111,
=
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
5
11
555111111;

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
3
4
333444+
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
3
4
333444×3,
=
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
3
4
333444×(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
3
4
333444×4,
=3;

 ④[1一(
1
2
-
1
4
)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2
1
2
111222-
1
4
)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2
1
4
111444)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2
2
3
222333,
=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2
1
4
111444]×
2
3

=
3
4
×
2
3

=
1
2
2
3
222333,
=
3
4
×
2
3

=
1
2
3
4
333444×
2
3

=
1
2
2
3
222333,
=
1
2
1
2
111222.