题目内容

(1)(
1
4
-
1
4
×99)÷
25
24

(2)
4
7
×
8
9
+
3
7
×
8
9

(3)(16×
3
8
+4)÷
2
7
(1)(
1
4
+
1
4
×99)÷
25
24

=
1
4
×100×
24
25

=24;

(2)
4
7
×
8
9
+
3
7
×
8
9

=(
4
7
+
3
7
)×
8
9

=1×
8
9

=
8
9


(3)(16×
3
8
+4)÷
2
7

=(6+4)×
7
2

=10×
7
2

=35.
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