题目内容
解方程:
①x-40%x=120
②15x-30=150
③5x-
=
④x+
=240.
①x-40%x=120
②15x-30=150
③5x-
| 5 |
| 6 |
| 5 |
| 4 |
④x+
| x |
| 5 |
(1)x-40%x=120,
60%x=120,
60%x÷60%=120÷60%,
x=200;
(2)15x-30=150,
15x-30+30=150+30,
15x÷15=180÷15,
x=12;
(3)5x-
=
,
5x-
+
=
+
,
5x÷5=
÷5,
x=
;
(4)x+
=240,
x=240,
x÷
=240÷
,
x=200.
60%x=120,
60%x÷60%=120÷60%,
x=200;
(2)15x-30=150,
15x-30+30=150+30,
15x÷15=180÷15,
x=12;
(3)5x-
| 5 |
| 6 |
| 5 |
| 4 |
5x-
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 4 |
| 5 |
| 6 |
5x÷5=
| 25 |
| 12 |
x=
| 5 |
| 12 |
(4)x+
| x |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
x=200.
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