题目内容
解方程.
(1)
﹕
=8﹕x
(2)4x-2.5x=0.75
(3)2.5x+3x=8.5.
(1)
| 1 |
| 4 |
| 1 |
| 12 |
(2)4x-2.5x=0.75
(3)2.5x+3x=8.5.
(1)
﹕
=8﹕x,
x=
×8,
x÷
=
×8÷
,
x=
×8×4,
x=
;
(2)4x-2.5x=0.75,
1.5x=0.75,
1.5x÷1.5=0.75÷1.5,
x=0.5;
(3)2.5x+3x=8.5,
5.5x=8.5,
5.5x÷5.5=8.5÷5.5,
x=
.
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 4 |
x=
| 1 |
| 12 |
x=
| 8 |
| 3 |
(2)4x-2.5x=0.75,
1.5x=0.75,
1.5x÷1.5=0.75÷1.5,
x=0.5;
(3)2.5x+3x=8.5,
5.5x=8.5,
5.5x÷5.5=8.5÷5.5,
x=
| 17 |
| 11 |
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