题目内容
解方程.
9÷
| 1-25%x=0.5. |
(1)9÷
x=
,
9÷
x×
x=
×
x,
9=
x,
9×4=
x×4,
x=36;
(2)1-25%x=0.5,
1-0.25x+0.25x=0.5+0.25x,
1-0.5=0.5+0.25x-0.5,
0.5÷0.25=0.25x÷0.25,
x=2.
| 3 |
| 4 |
| 1 |
| 3 |
9÷
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
9=
| 1 |
| 4 |
9×4=
| 1 |
| 4 |
x=36;
(2)1-25%x=0.5,
1-0.25x+0.25x=0.5+0.25x,
1-0.5=0.5+0.25x-0.5,
0.5÷0.25=0.25x÷0.25,
x=2.
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