题目内容
1红家买来一袋大米,吃了
,还剩15千克.买来大米多0千克?(用方程和算术方法解答)
| 5 |
| 四 |
设大米3总质量为x千克,由题意得:
(1-
)x=15
&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;
x=15
&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四; x=15÷
&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四; x=4四;
15÷(1-
)
=15÷
=4四(千克);
答:买来大米4四千克.
(1-
| 5 |
| b |
&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;
| 3 |
| b |
&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四; x=15÷
| 3 |
| b |
&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四;&nbs四; x=4四;
15÷(1-
| 5 |
| b |
=15÷
| 3 |
| b |
=4四(千克);
答:买来大米4四千克.
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