题目内容
用简便方法计算,要写出简算过程
| 94×99 | (
| 10-
|
(1)
-(3.19+
),
=
-
-3.19,
=4-3.19,
=0.81;
(2)94×99,
=94×(100-1),
=94×100-94×1,
=9400-94,
=9306;
(3)(
-
)÷
+0.8,
=
÷
+0.8,
=
+0.8,
=2.05;
(4)10-
÷
+5.2,
=10-6+5.2,
=4+5.2,
=9.2.
| 31 |
| 7 |
| 3 |
| 7 |
=
| 31 |
| 7 |
| 3 |
| 7 |
=4-3.19,
=0.81;
(2)94×99,
=94×(100-1),
=94×100-94×1,
=9400-94,
=9306;
(3)(
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 25 |
=
| 1 |
| 20 |
| 1 |
| 25 |
=
| 5 |
| 4 |
=2.05;
(4)10-
| 9 |
| 13 |
| 3 |
| 26 |
=10-6+5.2,
=4+5.2,
=9.2.
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