题目内容
计算,能简便的用简便方法算.
| 1650-480÷16×15 | 0.4×7.6×25×1000 | ||||||||||||
(
|
|
(1)1650-480÷16×15,
=1650-30×15,
=1650-450,
=1200;
(2)0.4×7.6×25×1000,
=(0.4×25)×(7.6×1000),
=10×7600,
=76000;
(3)(
+
)×20,.
=
×20+
×20,
=15+8,
=23;
(4)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=1650-30×15,
=1650-450,
=1200;
(2)0.4×7.6×25×1000,
=(0.4×25)×(7.6×1000),
=10×7600,
=76000;
(3)(
| 3 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 4 |
| 2 |
| 5 |
=15+8,
=23;
(4)
| 7 |
| 9 |
| 13 |
| 5 |
| 2 |
| 9 |
| 5 |
| 13 |
=
| 7 |
| 9 |
| 5 |
| 13 |
| 2 |
| 9 |
| 5 |
| 13 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 13 |
=1×
| 5 |
| 13 |
=
| 5 |
| 13 |
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