题目内容
解方程:
|
|
Χ-10%Χ=81. |
(1)
Χ+
=1,
Χ+
-
=1-
,
X×
=
×
,
X=
;
(2)
X+
X=
,
X=
,
X×
=
×
,
X=
;
(3)Χ-10%Χ=81,
0.9X=81,
0.9X÷0.9=81÷0.9,
X=90.
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 2 |
| 1 |
| 4 |
| 3 |
| 2 |
X=
| 3 |
| 8 |
(2)
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
| 17 |
| 12 |
| 1 |
| 6 |
| 17 |
| 12 |
| 12 |
| 17 |
| 1 |
| 6 |
| 12 |
| 17 |
X=
| 2 |
| 17 |
(3)Χ-10%Χ=81,
0.9X=81,
0.9X÷0.9=81÷0.9,
X=90.
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