题目内容
求未知数Χ的值:
(1)3Χ-
Χ=
(2)
=
:
.
(1)3Χ-
| 3 |
| 4 |
| 18 |
| 19 |
(2)
| 18 |
| Χ |
| 3 |
| 10 |
| 3 |
| 5 |
解;(1)3x-
x=
,
2
x=
,
2
x÷2
=
÷2
,
x=
×
,
x=
;
(2)
=
:
,
x=
×18,
x×
=
×
,
x=36.
| 3 |
| 4 |
| 18 |
| 19 |
2
| 1 |
| 4 |
| 18 |
| 19 |
2
| 1 |
| 4 |
| 1 |
| 4 |
| 18 |
| 19 |
| 1 |
| 4 |
x=
| 18 |
| 19 |
| 4 |
| 9 |
x=
| 8 |
| 19 |
(2)
| 18 |
| x |
| 3 |
| 10 |
| 3 |
| 5 |
| 3 |
| 10 |
| 3 |
| 5 |
| 3 |
| 10 |
| 10 |
| 3 |
| 54 |
| 5 |
| 10 |
| 3 |
x=36.
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