题目内容
计算下面各题.注意怎样简便就怎样算!
÷(1.625-
-
)
[
-(
+
)]×
.
| 5 |
| 8 |
| 6 |
| 11 |
| 5 |
| 11 |
[
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
| 9 |
| 4 |
分析:解决好这两道题目的关键是,一个数连续减去两个数可以用这个数减去这两个数的和;反之一个数减去两个数的和,可以用这个数分别减去这两个数,这使我们的计算更加简便.
解答:解:
÷(1.625-
-
)
=
÷[1.625-(
+
)],
=
÷
,
=1;
[
-(
+
)]×
=[
-
-
]×
,
=[
-
]×
,
=
×
,
=
.
| 5 |
| 8 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 5 |
| 8 |
| 6 |
| 11 |
| 5 |
| 11 |
=
| 5 |
| 8 |
| 5 |
| 8 |
=1;
[
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
| 9 |
| 4 |
=[
| 5 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
| 9 |
| 4 |
=[
| 2 |
| 3 |
| 1 |
| 3 |
| 9 |
| 4 |
=
| 1 |
| 3 |
| 9 |
| 4 |
=
| 3 |
| 4 |
点评:本题主要考查分数四则混合运算的顺序及运算定律的运用.
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