题目内容
求未知数x.
①x-
+
=
②
=
.
①x-
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
②
| 1.2 |
| 7.5 |
| 0.4 |
| x |
x-
+
=
,
x-
+
-
=
+
,
x-
=
,
x=
+
,
x=1
;
(2)
=
,
1.2x=0.4×7.5,
1.2x=3,
1.2x÷1.2=3÷1.2
x=2.5.
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
x-
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
x-
| 1 |
| 3 |
| 17 |
| 12 |
x=
| 17 |
| 12 |
| 1 |
| 3 |
x=1
| 3 |
| 4 |
(2)
| 1.2 |
| 7.5 |
| 0.4 |
| x |
1.2x=0.4×7.5,
1.2x=3,
1.2x÷1.2=3÷1.2
x=2.5.
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