题目内容
计算题(1)[(-
| 1 |
| 3 |
| 1 |
| 4 |
| 3 |
| 2 |
(2)1
| 1 |
| 2 |
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 2 |
| 1 |
| 2 |
| 2 |
| 5 |
分析:根据有理数混合运算的顺序:先算乘方,再算乘除,最后算加减;同级运算,应按从左到右的顺序进行计算;如果有括号,要先做括号内的运算.
解答:解:(1)原式=[
+(-
)×16×4]×(-
)
=[
-16]×(-
)
=
×(-
)-16×(-
)
=-
+72
=71.5;
(2)原式=
×
-(-
)×
+(-
)×
=
+
-
=
=2.5.
| 1 |
| 9 |
| 1 |
| 4 |
| 9 |
| 2 |
=[
| 1 |
| 9 |
| 9 |
| 2 |
=
| 1 |
| 9 |
| 9 |
| 2 |
| 9 |
| 2 |
=-
| 1 |
| 2 |
=71.5;
(2)原式=
| 3 |
| 2 |
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 2 |
| 1 |
| 2 |
| 5 |
| 7 |
=
| 15 |
| 14 |
| 25 |
| 14 |
| 5 |
| 14 |
=
| 35 |
| 14 |
=2.5.
点评:本题考查的是有理数的运算能力,解答此题时要注意有带分数的化成假分数再进行计算.
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