问题 解答题
用你喜欢的方法计算.友情提示:可要注意使用简便方法哟!
7
8
+(
1
4
-
1
5
1
4

4
9
×[
3
4
-(
7
16
-
1
4
)]

3
4
÷[3.75×(1.2-
1
5
)]

15×14×(
1
5
+
1
7
)

(
1
3
-
1
13
)×6-7÷13
答案

(1)

7
8
+(
1
4
-
1
5
)÷
1
4

=

7
8
+
1
20
×4,

=

1
8
+
1
5

=

13
40

(2)

4
9
×[
3
4
-(
7
16
-
1
4
)],

=

4
9
×[
3
4
+
1
4
-
7
16
],

=

4
9
×[1-
7
16
],

=

4
9
×
9
16

=

1
4

(3)

3
4
÷[3.75×(1.2-
1
5
)],

=

3
4
÷[3.75×(1.2-0.2)],

=

3
4
÷[
15
4
×1],

=

3
4
÷
15
4

=

3
4
×
4
15

=

1
5

(4)15×14×(

1
5
+
1
7
),

=15×14×

1
5
+15×14×
1
7

=42+30,

=72;

(5)(

1
3
-
1
13
)×6-7÷13,

=

1
3
×6-
1
13
×6-
7
13

=2-(

6
13
+
7
13
),

=2-1,

=1.

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