题目内容
求未知数X.
8
÷x=3x÷5
=
0.21÷x=2
.
8
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 14 |
| 1 |
| 3 |
(1)8
÷x=3;
8
÷x×x=3×x,
3x=8
,
3x÷3=8
÷3,
x=2
;
(2)x÷5
=
,
x÷5
×5
=
×5
,
x=1
;
(3)0.21÷x=2
,
0.21÷x×x=2
×x,
2
x=0.21,
2
x÷2
=0.21÷2
,
x=0.09.
| 1 |
| 4 |
8
| 1 |
| 4 |
3x=8
| 1 |
| 4 |
3x÷3=8
| 1 |
| 4 |
x=2
| 3 |
| 4 |
(2)x÷5
| 5 |
| 6 |
| 3 |
| 14 |
x÷5
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 14 |
| 5 |
| 6 |
x=1
| 1 |
| 4 |
(3)0.21÷x=2
| 1 |
| 3 |
0.21÷x×x=2
| 1 |
| 3 |
2
| 1 |
| 3 |
2
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=0.09.
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