题目内容
解方程
| x÷
| x-28%x=29.52 | (1-25%)x=15. |
(1)
x=
,
x÷
=
÷
,
x=
;
(2)x÷
=
,
x÷
×
=
×
,
x=
;
(3)x-28%x=29.52,
72%x=29.52,
72%x÷72%=29.52÷72%,
x=41;
(4)(1-25%)x=15,
75%x=15,
75%x÷75%=15÷75%,
x=20.
| 6 |
| 7 |
| 8 |
| 21 |
| 6 |
| 7 |
| 6 |
| 7 |
| 8 |
| 21 |
| 6 |
| 7 |
x=
| 4 |
| 9 |
(2)x÷
| 4 |
| 5 |
| 15 |
| 16 |
x÷
| 4 |
| 5 |
| 4 |
| 5 |
| 15 |
| 16 |
| 4 |
| 5 |
x=
| 3 |
| 4 |
(3)x-28%x=29.52,
72%x=29.52,
72%x÷72%=29.52÷72%,
x=41;
(4)(1-25%)x=15,
75%x=15,
75%x÷75%=15÷75%,
x=20.
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