题目内容
(1)
-
-
(2)99×2.8
(3)5.125×
+2.875÷4.
| 9 |
| 10 |
| 5 |
| 8 |
| 1 |
| 8 |
(2)99×2.8
(3)5.125×
| 1 |
| 4 |
(1)
-
-
=
-(
+
),
=
-
,
=
;
(2)99×2.8
=(100-1)×2.8,
=100×2.8-1×2.8,
=280-2.8,
=277.2;
(3)5.125×
+2.875÷4.
=5.125×
+2.875×
,
=(5.125+2.875)×
,
=8×
,
=2.
| 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 |
=5.125×
| 1 |
| 4 |
| 1 |
| 4 |
=(5.125+2.875)×
| 1 |
| 4 |
=8×
| 1 |
| 4 |
=2.
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