题目内容
| 巧解密码我能行. 5x-5×
|
12:5=x:0.3 |
|
(1)5x-5×
=0.8,
5x-
=0.8,
5x-
+
=0.8+
,
5x=
,
5x÷5=
÷5,
x=
;
(2)12:5=x:0.3,
5x=12×0.3,
5x÷5=3.6÷5,
x=0.72;
(3)
=
,
9x=0.45×16,
9x÷9=7.2÷9,
x=0.8.
| 1 |
| 3 |
5x-
| 5 |
| 3 |
5x-
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
5x=
| 37 |
| 15 |
5x÷5=
| 37 |
| 15 |
x=
| 37 |
| 75 |
(2)12:5=x:0.3,
5x=12×0.3,
5x÷5=3.6÷5,
x=0.72;
(3)
| 0.45 |
| x |
| 9 |
| 16 |
9x=0.45×16,
9x÷9=7.2÷9,
x=0.8.
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