题目内容
解方程:
| X-0.75X+1.6=12 | 1-
|
(1)
:3.5=1
:x,
x=3.5×1
,
x×
=4×
,
x=10;
(2)X-0.75X+1.6=12,
0.25X+1.6=12,
0.25X+1.6=12-1.6,
0.25X÷0.25=10.4÷0.25,
X=41.6;
(3)1-
X=
,
1-
X+
X=
+
X,
1-
=
+
X-
,
×
=
X×
,
X=
.
| 2 |
| 5 |
| 1 |
| 7 |
| 2 |
| 5 |
| 1 |
| 7 |
| 2 |
| 5 |
| 5 |
| 2 |
| 5 |
| 2 |
x=10;
(2)X-0.75X+1.6=12,
0.25X+1.6=12,
0.25X+1.6=12-1.6,
0.25X÷0.25=10.4÷0.25,
X=41.6;
(3)1-
| 3 |
| 4 |
| 3 |
| 5 |
1-
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
1-
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 2 |
| 5 |
| 4 |
| 3 |
| 3 |
| 4 |
| 4 |
| 3 |
X=
| 8 |
| 15 |
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