题目内容
脱式计算:
÷[(3.2-
)×2.5]
6.5×[
÷(4-2.5×
)].
| 11 |
| 4 |
| 8 |
| 3 |
6.5×[
| 10 |
| 3 |
| 14 |
| 15 |
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:
÷[(3.2-
)×2.5]
=
÷[(
-
)×2.5],
=
÷[
×
],
=
×
,
=
;
6.5×[
÷(4-2.5×
)].
=6.5×[
÷(4-
×
)],
=6.5×[
÷(4-2
)],
=6.5×[
×
],
=6.5×2,
=13.
| 11 |
| 4 |
| 8 |
| 3 |
=
| 11 |
| 4 |
| 16 |
| 5 |
| 8 |
| 3 |
=
| 11 |
| 4 |
| 8 |
| 15 |
| 5 |
| 2 |
=
| 11 |
| 4 |
| 3 |
| 4 |
=
| 33 |
| 16 |
6.5×[
| 10 |
| 3 |
| 14 |
| 15 |
=6.5×[
| 10 |
| 3 |
| 5 |
| 2 |
| 14 |
| 15 |
=6.5×[
| 10 |
| 3 |
| 1 |
| 3 |
=6.5×[
| 10 |
| 3 |
| 3 |
| 5 |
=6.5×2,
=13.
点评:完成脱式计算时要注意计算过程的完整性,中间不要有太大跳跃.
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