题目内容
简便计算
| 16.4+3.5+83.6+166.5 | (19-
|
|
(1)16.4+3.5+83.6+166.5,
=(16.4+83.6)+(3.5+166.5),
=100+170,
=270;
(2)(19-
)÷19+
,
=19×
-
×
+
,
=1-
+
=1+
-
,
=1
,
=1
;
(3)
×7.7+3.3×0.8-80%,
=0.8×(7.7+3.3-1),
=0.8×10,
=8.
=(16.4+83.6)+(3.5+166.5),
=100+170,
=270;
(2)(19-
| 57 |
| 80 |
| 7 |
| 80 |
=19×
| 1 |
| 19 |
| 57 |
| 80 |
| 1 |
| 19 |
| 7 |
| 80 |
=1-
| 3 |
| 80 |
| 7 |
| 80 |
=1+
| 7 |
| 80 |
| 3 |
| 80 |
=1
| 4 |
| 80 |
=1
| 1 |
| 20 |
(3)
| 4 |
| 5 |
=0.8×(7.7+3.3-1),
=0.8×10,
=8.
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