题目内容
求未知数x:
x:
=0.9
9x-1.8=5.4
:
=
:x.
x:
| 5 |
| 6 |
9x-1.8=5.4
| 3 |
| 5 |
| 7 |
| 12 |
| 9 |
| 10 |
(1)x:
=0.9,
x:
=0.9:1,
x=
×0.9,
x=0.75;
(2)9x-1.8=5.4,
9x-1.8+1.8=5.4+1.8,
9x=7.2,
9x÷9=7.2÷9,
x=0.8;
(3)
:
=
:x,
x=
×
,
x=
,
x×
=
×
,
x=
.
| 5 |
| 6 |
x:
| 5 |
| 6 |
x=
| 5 |
| 6 |
x=0.75;
(2)9x-1.8=5.4,
9x-1.8+1.8=5.4+1.8,
9x=7.2,
9x÷9=7.2÷9,
x=0.8;
(3)
| 3 |
| 5 |
| 7 |
| 12 |
| 9 |
| 10 |
| 3 |
| 5 |
| 7 |
| 12 |
| 9 |
| 10 |
| 3 |
| 5 |
| 7 |
| 40 |
| 3 |
| 5 |
| 5 |
| 3 |
| 7 |
| 40 |
| 5 |
| 3 |
x=
| 7 |
| 24 |
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