题目内容
求未知数x.
(1)x-25%x=
(2)
x-
=0.75
(3)
:0.5=3:x.
(1)x-25%x=
| 3 |
| 8 |
(2)
| 2 |
| 5 |
| 1 |
| 8 |
(3)
| 1 |
| 5 |
(1)x-25%x=
,
75%x=
,
75%x÷75%=
÷75%,
x=0.5;
(2)
x-
=0.75,
x-
+
=0.75+
,
x÷
=
÷
,
x=2
.
(3)
:0.5=3:x,
x=0.5×3,
x÷
=1.5÷
,
x=7.5.
| 3 |
| 8 |
75%x=
| 3 |
| 8 |
75%x÷75%=
| 3 |
| 8 |
x=0.5;
(2)
| 2 |
| 5 |
| 1 |
| 8 |
| 2 |
| 5 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 2 |
| 5 |
| 2 |
| 5 |
| 21 |
| 24 |
| 2 |
| 5 |
x=2
| 3 |
| 16 |
(3)
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
x=7.5.
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