题目内容

(1)
9
10
-
5
8
-
1
8

(2)99×2.8
(3)5.125×
1
4
+2.875÷4.
(1)
9
10
-
5
8
-
1
8

=
9
10
-(
5
8
+
1
8
),
=
9
10
-
3
4

=
3
20


(2)99×2.8
=(100-1)×2.8,
=100×2.8-1×2.8,
=280-2.8,
=277.2;

(3)5.125×
1
4
+2.875÷4.
=5.125×
1
4
+2.875×
1
4

=(5.125+2.875)×
1
4

=8×
1
4

=2.
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