题目内容
计算下面各题,能简算的要简算.
| (1-
| ||||||||||
| 7.5×2.8-7.5×1.8 | 12÷(
|
(1)
÷[(
+
)×
]
=
÷[
×
],
=
×
,
=
;
(2)(1-
)÷0.25×4
=
×4×4,
=
;
(3)7.5×2.8-7.5×1.8
=(2.8-1.8)×7.5,
=1×7.5,
=7.5;
(4)12÷(
-
+
)
=12÷(
+
-
),
=12÷(1-
),
=12×
,
=28.
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 1 |
| 2 |
| 3 |
| 4 |
=
| 8 |
| 9 |
| 8 |
| 3 |
=
| 64 |
| 27 |
(2)(1-
| 3 |
| 5 |
=
| 2 |
| 5 |
=
| 32 |
| 5 |
(3)7.5×2.8-7.5×1.8
=(2.8-1.8)×7.5,
=1×7.5,
=7.5;
(4)12÷(
| 7 |
| 12 |
| 4 |
| 7 |
| 5 |
| 12 |
=12÷(
| 7 |
| 12 |
| 5 |
| 12 |
| 4 |
| 7 |
=12÷(1-
| 4 |
| 7 |
=12×
| 7 |
| 3 |
=28.
练习册系列答案
相关题目