题目内容
列式计算.
(1)
减去它的
,所得的差除以
,商是多少?(列综合式计算)
(2)比一个数的62.5%少5的数是8.5,求这个数.(列方程解)
(1)
| 54 |
| 17 |
| 1 |
| 3 |
| 54 |
| 17 |
(2)比一个数的62.5%少5的数是8.5,求这个数.(列方程解)
(1)(
-
×
)÷
,
=[(1-
)×
]×
,
=
×
×
,
=
×(
×
),
=
;
(2)设这个数为x.
62.5%x-5=8.5,
62.5%x=13.5,
x=21.6.
| 54 |
| 17 |
| 54 |
| 17 |
| 1 |
| 3 |
| 54 |
| 17 |
=[(1-
| 1 |
| 3 |
| 54 |
| 17 |
| 17 |
| 54 |
=
| 2 |
| 3 |
| 54 |
| 17 |
| 17 |
| 54 |
=
| 2 |
| 3 |
| 54 |
| 17 |
| 17 |
| 54 |
=
| 2 |
| 3 |
(2)设这个数为x.
62.5%x-5=8.5,
62.5%x=13.5,
x=21.6.
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