题目内容
解方程
| X+20%X=120 | ⅹ-
| 15X+30=180 |
|
(1)X+20%X=120,
1.2X=120,
1.2X÷1.2=120÷1.2,
X=100;
(2)X-
X=
X÷
=
÷
,
X=
;
(3)15X+30=180,
15X+30-30=180-30,
15X÷15=150÷15,
x=10;
(4)
ⅹ-2=6,
ⅹ-2+2=6+2,
ⅹ÷
=8÷
,
x=16.
1.2X=120,
1.2X÷1.2=120÷1.2,
X=100;
(2)X-
| 2 |
| 3 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
| 5 |
| 9 |
| 1 |
| 3 |
X=
| 5 |
| 3 |
(3)15X+30=180,
15X+30-30=180-30,
15X÷15=150÷15,
x=10;
(4)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
x=16.
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