题目内容
解方程.
9:
| x-
| 1-25%x=0.5. |
(1)9:
=x:
,
X=9×
,
X×
=
×
,
X=2;
(2)x-
x=
,
X=
,
X×
=
×
,
x=3;
(3)1-25%x=0.5,
1-25%x+0.25x=0.5+0.25x,
0.5+0.25x=1,
0.5+0.25x-0.5=1-0.5,
0.25x÷0.25=0.5÷0.25,
x=2.
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 2 |
| 4 |
| 3 |
X=2;
(2)x-
| 3 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 5 |
| 2 |
| 6 |
| 5 |
| 5 |
| 2 |
x=3;
(3)1-25%x=0.5,
1-25%x+0.25x=0.5+0.25x,
0.5+0.25x=1,
0.5+0.25x-0.5=1-0.5,
0.25x÷0.25=0.5÷0.25,
x=2.
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