题目内容
解方程
5x+3.5=12.3
(x+
)×6=9
x÷0.5=12
21-5x=2x.
5x+3.5=12.3
(x+
| 3 |
| 4 |
x÷0.5=12
21-5x=2x.
(1)5x+3.5=12.3,
5x+3.5-3.5=12.3-3.5,
5x=8.8,
5x÷5=8.8÷5,
x=1.76;
(2)(x+
)×6=9,
6x+
×6=9,
6x+
=9,
6x+
-
=9-
,
6x=
,
6x÷6=
÷6,
x=
×
,
x=
;
(3)x÷0.5=12,
x÷0.5×0.5=12×0.5,
x=6;
(4)21-5x=2x,
21-5x+5x=2x+5x,
7x=21,
7x÷7=21÷7,
x=3.
5x+3.5-3.5=12.3-3.5,
5x=8.8,
5x÷5=8.8÷5,
x=1.76;
(2)(x+
| 3 |
| 4 |
6x+
| 3 |
| 4 |
6x+
| 9 |
| 2 |
6x+
| 9 |
| 2 |
| 9 |
| 2 |
| 9 |
| 2 |
6x=
| 9 |
| 2 |
6x÷6=
| 9 |
| 2 |
x=
| 9 |
| 2 |
| 1 |
| 6 |
x=
| 3 |
| 4 |
(3)x÷0.5=12,
x÷0.5×0.5=12×0.5,
x=6;
(4)21-5x=2x,
21-5x+5x=2x+5x,
7x=21,
7x÷7=21÷7,
x=3.
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