题目内容

计算下列各题,能简算的要简算.
4
25
×99+
4
25
5
9
×7+
5
9
×11
3
4
×(
17
18
-
5
9
25-
8
9
×
3
4
÷
1
27
(1)
4
25
×99+
4
25

=
4
25
×(99+1),
=
4
25
×100,
=16;

(2)
5
9
×7+
5
9
×11,
=
5
9
×(7+11),
=
5
9
×18,
=10;

(3)
3
4
×(
17
18
-
5
9
),
=
3
4
×
7
18

=
7
24


(4)25-
8
9
×
3
4
÷
1
27

=25-
2
3
÷
1
27

=25-18,
=7.
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