题目内容
解方程.
(1)1-
x=
(2)x-0.3x-4.5=9.5
(3)
=
.
(1)1-
| 1 |
| 3 |
| 1 |
| 4 |
(2)x-0.3x-4.5=9.5
(3)
| x |
| 0.2 |
| 21 |
| 8 |
(1)1-
x=
,
1-
x+
x=
+
x,
1-
=
+
x-
,
÷
=
x÷
,
x=2
;
(2)x-0.3x-4.5=9.5,
0.7x-4.5+4.5=9.5+4.5,
0.7x÷0.7=14÷0.7,
x=20;
(3)
=
,
8x=21×0.2,
8x÷8=4.2÷8,
x=0.525.
| 1 |
| 3 |
| 1 |
| 4 |
1-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
1-
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=2
| 1 |
| 4 |
(2)x-0.3x-4.5=9.5,
0.7x-4.5+4.5=9.5+4.5,
0.7x÷0.7=14÷0.7,
x=20;
(3)
| x |
| 0.2 |
| 21 |
| 8 |
8x=21×0.2,
8x÷8=4.2÷8,
x=0.525.
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