题目内容
解方程:
①
:0.4=x:
②
-
x=
.
①
| 7 |
| 2 |
| 8 |
| 7 |
②
| 31 |
| 6 |
| 33 |
| 10 |
| 17 |
| 4 |
(1)
:0.4=x:
,
0.4x=
×
,
0.4x÷0.4=4÷0.4,
x=10;
(2)
-
x=
,
-
x+
x=
+
x,
-
=
+
x-
,
=
x,
÷
=
x÷
,
x=
.
| 7 |
| 2 |
| 8 |
| 7 |
0.4x=
| 7 |
| 2 |
| 8 |
| 7 |
0.4x÷0.4=4÷0.4,
x=10;
(2)
| 31 |
| 6 |
| 33 |
| 10 |
| 17 |
| 4 |
| 31 |
| 6 |
| 33 |
| 10 |
| 33 |
| 10 |
| 17 |
| 4 |
| 33 |
| 10 |
| 31 |
| 6 |
| 17 |
| 4 |
| 17 |
| 4 |
| 33 |
| 10 |
| 17 |
| 4 |
| 11 |
| 12 |
| 33 |
| 10 |
| 11 |
| 12 |
| 33 |
| 10 |
| 33 |
| 10 |
| 33 |
| 10 |
x=
| 5 |
| 18 |
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