题目内容
求知数X.
÷X=
=
.
| 5 |
| 9 |
| 5 |
| 12 |
| 0.3 |
| 9 |
| X |
| 2.5 |
(1)
÷x=
,
÷x×x=
×x,
x=
,
x×
=
×
,
x=
;
(2)
=
,
9x=0.3×2.5,
9x=0.75,
9x÷9=0.75÷9,
x=
.
| 5 |
| 9 |
| 5 |
| 12 |
| 5 |
| 9 |
| 5 |
| 12 |
| 5 |
| 12 |
| 5 |
| 9 |
| 5 |
| 12 |
| 12 |
| 5 |
| 5 |
| 9 |
| 12 |
| 5 |
x=
| 4 |
| 3 |
(2)
| 0.3 |
| 9 |
| x |
| 2.5 |
9x=0.3×2.5,
9x=0.75,
9x÷9=0.75÷9,
x=
| 1 |
| 12 |
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