题目内容
求未知数Χ的值:
(1)3x-
x=
(2)
x+5×4=95
(3)
=
:
.
(1)3x-
| 3 |
| 4 |
| 18 |
| 19 |
(2)
| 3 |
| 5 |
(3)
| 18 |
| x |
| 3 |
| 10 |
| 3 |
| 5 |
(1)3X-
X=
,
(3-
)X=
,
X=
,
X÷
=
÷
,
X=
×
,
X=
;
(2)
x+5×4=95,
x+20=95,
x+20-20=95-20,
x=75,
x÷
=75÷
,
x=75×
,
x=125;
(3)
=
:
,
18:x=1:2,
x=18×2,
x=36.
| 3 |
| 4 |
| 18 |
| 19 |
(3-
| 3 |
| 4 |
| 18 |
| 19 |
| 9 |
| 4 |
| 18 |
| 19 |
| 9 |
| 4 |
| 9 |
| 4 |
| 18 |
| 19 |
| 9 |
| 4 |
X=
| 18 |
| 19 |
| 4 |
| 9 |
X=
| 8 |
| 19 |
(2)
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
x=75×
| 5 |
| 3 |
x=125;
(3)
| 18 |
| x |
| 3 |
| 10 |
| 3 |
| 5 |
18:x=1:2,
x=18×2,
x=36.
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