问题 解答题
怎样简便就怎样算.
1
4
+
1
5
)×
4
9
5
8
×
1
4
+
3
4
×
5
8
48×(
7
12
+
1
6
)÷
2
3
(1-
3
4
×
4
5
)÷
8
15
4
25
×99+
4
25
7
9
-
1
4
)×36.
答案

(1)(

1
4
+
1
5
)×
4
9

=

9
20
×
4
9

=

1
5

(2)

5
8
×
1
4
+
3
4
×
5
8

=

5
8
×(
1
4
+
3
4
),

=

5
8
×1,

=

5
8

(3)48×(

7
12
+
1
6
)÷
2
3

=(48×

7
12
+48×
1
6
)÷
2
3

=(28+8)÷

2
3

=36÷

2
3

=54;

(4)(1-

3
4
×
4
5
)÷
8
15

=(1-

3
5
)÷
8
15

=

2
5
÷
8
15

=

3
4

(5)

4
25
×99+
4
25

=

4
25
×(99+1),

=

4
25
×100,

=16;

(6)(

7
9
-
1
4
)×36,

=

7
9
×36-
1
4
×36,

=28-9,

=19;

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