题目内容
| 求未知数x的值(1)8:x=3:2.4 | (2)2x+
|
(1)8:x=3:2.4,
3x=2.4×8,
3x÷3=19.2÷3,
x=6.4;
(2)2x+
x=18,
(2+
)x=18,
x=18,
x×
=18×
,
x=
.
3x=2.4×8,
3x÷3=19.2÷3,
x=6.4;
(2)2x+
| 2 |
| 5 |
(2+
| 2 |
| 5 |
| 12 |
| 5 |
| 12 |
| 5 |
| 5 |
| 12 |
| 5 |
| 12 |
x=
| 15 |
| 2 |
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