题目内容
解方程.
(1)χ-
χ=
(2)42:
=χ:
(3)5x-0.4=75%
(1)χ-
| 3 |
| 5 |
| 6 |
| 5 |
(2)42:
| 3 |
| 5 |
| 5 |
| 7 |
(3)5x-0.4=75%
(1)χ-
χ=
,
x=
,
x÷
=
÷
,
x=3;
(2)42:
=χ:
x=42×
,
x÷
=30÷
,
x=50;
(3)5x-0.4=75%,
5x-0.4+0.4=75%+0.4,
5x÷5=1.15÷5,
x=0.23.
| 3 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
x=3;
(2)42:
| 3 |
| 5 |
| 5 |
| 7 |
| 3 |
| 5 |
| 5 |
| 7 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
x=50;
(3)5x-0.4=75%,
5x-0.4+0.4=75%+0.4,
5x÷5=1.15÷5,
x=0.23.
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