题目内容
解方程
| X-80%X=
| X-
| 7X-X=7.2 |
(1)
-x=
,
-x+x=
+x,
+x-
=
-
,
x=
;
(2)x-80%x=
,
20%x=
,
20%x÷20%=
÷20%,
x=7.5;
(3)x-
×
=
,
x-
=
,
x-
+
=
+
,
x=1;
(4)7x-x=7.2,
6x=7.2,
6x÷6=7.2÷6,
x=1.2.
| 2 |
| 3 |
| 3 |
| 5 |
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 3 |
| 3 |
| 5 |
x=
| 1 |
| 15 |
(2)x-80%x=
| 3 |
| 2 |
20%x=
| 3 |
| 2 |
20%x÷20%=
| 3 |
| 2 |
x=7.5;
(3)x-
| 5 |
| 9 |
| 3 |
| 5 |
| 2 |
| 3 |
x-
| 1 |
| 3 |
| 2 |
| 3 |
x-
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
x=1;
(4)7x-x=7.2,
6x=7.2,
6x÷6=7.2÷6,
x=1.2.
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