题目内容
(2006?华亭县)
计算:
|
25%×(6.8-
|
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:
÷[
-(
+
)]
=
÷[
-
],
=
÷
,
=
;
(
-
)÷(
+
)
=
÷
,
=
;
25%×(6.8-
÷0.75)+
÷1.25
=25%×(6.8-
×
)+0.3,
=25%×(6.8-0.8)+0.3,
=25%×6+0.3,
=1.5+0.3.
=1.8.
| 7 |
| 8 |
| 5 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 7 |
| 8 |
| 5 |
| 3 |
| 1 |
| 2 |
=
| 7 |
| 8 |
| 7 |
| 6 |
=
| 3 |
| 4 |
(
| 7 |
| 8 |
| 3 |
| 16 |
| 2 |
| 3 |
| 5 |
| 9 |
=
| 11 |
| 16 |
| 11 |
| 9 |
=
| 9 |
| 16 |
25%×(6.8-
| 3 |
| 5 |
| 3 |
| 8 |
=25%×(6.8-
| 3 |
| 5 |
| 4 |
| 3 |
=25%×(6.8-0.8)+0.3,
=25%×6+0.3,
=1.5+0.3.
=1.8.
点评:当算式中同时含有分数、小数、百分数时,要注意根据式中数据的特点,灵活将它们互化后进行计算.
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