题目内容
求未知数χ.(4%)
(1)4+0.7χ=102
(2)
:
=x:
.
(1)4+0.7χ=102
(2)
| 1 |
| 6 |
| 3 |
| 5 |
| 9 |
| 5 |
(1)4+0.7χ=102
4+0.7X-4=102-4,
0.7X=98,
0.7X÷0.7=98÷0.7,
x=140;
(2)
:
=x:
X=
×
,
X÷
=
×
÷
,
X=
.
4+0.7X-4=102-4,
0.7X=98,
0.7X÷0.7=98÷0.7,
x=140;
(2)
| 1 |
| 6 |
| 3 |
| 5 |
| 9 |
| 5 |
| 3 |
| 5 |
| 1 |
| 6 |
| 9 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 1 |
| 6 |
| 9 |
| 5 |
| 3 |
| 5 |
X=
| 1 |
| 2 |
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