题目内容
| 求未知数. Χ-10%=
|
|
|
(1)Χ-10%=
,
Χ-0.1=0.9,
Χ-0.1+0.1=0.9+0.1,
Χ=1;
(2)
=
,
12x=4×75,
12x÷12=300÷12,
x=25;
(3)
x÷
=20,
x÷
×
=20×
,
x=16,
x×
=16×
,
x=25
.
| 9 |
| 10 |
Χ-0.1=0.9,
Χ-0.1+0.1=0.9+0.1,
Χ=1;
(2)
| 12 |
| 75 |
| 4 |
| x |
12x=4×75,
12x÷12=300÷12,
x=25;
(3)
| 5 |
| 8 |
| 4 |
| 5 |
| 5 |
| 8 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 8 |
| 5 |
| 8 |
| 8 |
| 5 |
| 8 |
| 5 |
x=25
| 3 |
| 5 |
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