题目内容
解方程
7X÷
| 1+20%X=2.4 | X-
|
(1)7X÷
=
,
7X÷
×
=
×
,
7X÷7=
÷7,
X=
;
(2)1+20%X=2.4,
1+20%X-1=2.4-1,
0.2X÷0.2=1.4÷0.2,
X=7;
(3)X-
X=
,
X=
,
X×
=
×
,
X=
.
| 1 |
| 2 |
| 3 |
| 5 |
7X÷
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 5 |
| 1 |
| 2 |
7X÷7=
| 3 |
| 10 |
X=
| 3 |
| 70 |
(2)1+20%X=2.4,
1+20%X-1=2.4-1,
0.2X÷0.2=1.4÷0.2,
X=7;
(3)X-
| 4 |
| 9 |
| 15 |
| 16 |
| 5 |
| 9 |
| 15 |
| 16 |
| 5 |
| 9 |
| 9 |
| 5 |
| 15 |
| 16 |
| 9 |
| 5 |
X=
| 27 |
| 16 |
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