题目内容
解方程.
(1)2.25×2-25%x=1
(2)
-
=3.
(1)2.25×2-25%x=1
| 1 |
| 2 |
(2)
| x |
| 5 |
| x |
| 6 |
(1)2.25×2-25%x=1
,
4.5-25%x=1
,
4.5-25%x+25%25x=1
+25%x,
25%x+1
=4.5,
25%x+1
-1
=4.5-1
,
25%x=3,
25%x÷25%=3÷25%,
x=12;
(2)
-
=3,
x=3,
x÷
=3÷
,
x=90.
| 1 |
| 2 |
4.5-25%x=1
| 1 |
| 2 |
4.5-25%x+25%25x=1
| 1 |
| 2 |
25%x+1
| 1 |
| 2 |
25%x+1
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
25%x=3,
25%x÷25%=3÷25%,
x=12;
(2)
| x |
| 5 |
| x |
| 6 |
| 1 |
| 30 |
| 1 |
| 30 |
| 1 |
| 30 |
| 1 |
| 30 |
x=90.
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