题目内容
计算下列各题:
(1)
;
(2).[(3
)
-(5
)0.5+(0.008)-
÷(0.02)-
×(0.32)
]÷0.06250.25.
(1)
| lg2+lg5-lg8 |
| lg50-lg40 |
(2).[(3
| 3 |
| 8 |
| 2 |
| 3 |
| 4 |
| 9 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
解 (1)原式=
=
=1.
(2)原式=[(
)
-(
)
+(
)
÷
×
]÷(
)
=(
-
+25×
×
)÷
=(-
+2)×2=
.
lg
| ||
lg
|
lg
| ||
lg
|
(2)原式=[(
| 8 |
| 27 |
| 2 |
| 3 |
| 49 |
| 9 |
| 1 |
| 2 |
| 1 000 |
| 8 |
| 2 |
| 3 |
| 50 |
4
| ||
| 10 |
| 625 |
| 10 000 |
| 1 |
| 4 |
=(
| 4 |
| 9 |
| 7 |
| 3 |
| 1 | ||
5
|
4
| ||
| 10 |
| 1 |
| 2 |
=(-
| 17 |
| 9 |
| 2 |
| 9 |
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