题目内容
解方程.
(1-20%)x=180 x-
x=
x=35.
(1-20%)x=180 x-
| 2 |
| 3 |
| 5 |
| 9 |
| 7 |
| 4 |
(1)(1-20%)x=180,
0.8x=180,
0.8x÷0.8=180÷0.8,
x=225,
(2)x-
x=
,
x=
,
x×3=
×3,
x=
,
(3)
x=35,
x×
=35×
,
x=20.
0.8x=180,
0.8x÷0.8=180÷0.8,
x=225,
(2)x-
| 2 |
| 3 |
| 5 |
| 9 |
| 1 |
| 3 |
| 5 |
| 9 |
| 1 |
| 3 |
| 5 |
| 9 |
x=
| 5 |
| 3 |
(3)
| 7 |
| 4 |
| 7 |
| 4 |
| 4 |
| 7 |
| 4 |
| 7 |
x=20.
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