题目内容
解方程:
x+20%x=90
6x-
x=34
62.5%x-
=
.
x+20%x=90
6x-
| 1 |
| 3 |
62.5%x-
| 1 |
| 8 |
| 3 |
| 8 |
(1)x+20%x=90,
1.2x=90,
1.2x÷1.2=90÷1.2,
x=75;
(2)6x-
x=34,
x=34,
x×
=34×
,
x=6;
(3)62.5%x-
=
,
62.5%x-
+
=
+
,
62.5%x÷62.5%=
÷62.5%,
x=0.8.
1.2x=90,
1.2x÷1.2=90÷1.2,
x=75;
(2)6x-
| 1 |
| 3 |
| 17 |
| 3 |
| 17 |
| 3 |
| 3 |
| 17 |
| 3 |
| 17 |
x=6;
(3)62.5%x-
| 1 |
| 8 |
| 3 |
| 8 |
62.5%x-
| 1 |
| 8 |
| 1 |
| 8 |
| 3 |
| 8 |
| 1 |
| 8 |
62.5%x÷62.5%=
| 1 |
| 2 |
x=0.8.
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