题目内容
| 计算下面各题,能简便的尽量简便. (
| [
| 20.07×1994-19.93×2007 | ||||||||||||||||
| 2.5×0.875+0.25×1.25 | 999
| 2.5-
|
(1)(
+
-
)÷
,
=(
+
-
)×24,
=
×24+
×24-
×24,
=20+21-10,
=31,
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 24 |
=(
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 12 |
=
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 12 |
=20+21-10,
=31,
(2)[
=[
=[
=
=
(3)20.07×1994-19.93×2007, =(20.07×100)×(1994÷100)-19.93×2007, =2007×19.94-19.93×2007, =2007×(19.94-19.93), =2007×0.01, =20.07, (4)2.5×0.875+0.25×1.25, =2.5×0.875+(0.25×10)×(1.25÷10), =2.5×0.875+2.5×0.125, =2.5×(0.875+0.125), =2.5×1, =2.5, (5)999
=(999+
=(1000-1+100-1+10-1)+(
=1110-3+3, =1110, (6)2.5-
=2.5-
=2.5-
=2.5-(
=2.5-1, =1.5, |
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