题目内容
| 解下列方程. (1)x+15%x=230 | (2)x+
| (3)15x+30=1890. |
(1)x+15%x=230,
(1+15%)x=230,
1.15x=230,
1.15x÷1.15=230÷1.15,
x=200;
(2)x+
=420,
(1+
)x=420,
x=420,
x×
=420×
,
x=360;
(3)15x+30=1890,
15x+30-30=1890-30,
15x=1860,
15x÷15=1860÷15,
x=124.
(1+15%)x=230,
1.15x=230,
1.15x÷1.15=230÷1.15,
x=200;
(2)x+
| x |
| 6 |
(1+
| 1 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 6 |
| 7 |
| 6 |
| 7 |
x=360;
(3)15x+30=1890,
15x+30-30=1890-30,
15x=1860,
15x÷15=1860÷15,
x=124.
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