题目内容
解方程.
(
| 7x÷
|
| ||||||||||||||||
| x-15%x=37.4 | X+
| x÷(1-
|
(1)(
-
)x=
,
x÷
=
÷
,
x=2.4;
(2)7x÷
=
,
7x÷
×
=
×
,
7x÷7=
÷7,
x=
;
(3)
x-
x=
,
x=
,
x÷
=
÷
,
x=1.75;
(4)x-15%x=37.4,
85%x÷85%=37.4÷85%,
x=44;
(5)X+
=
,
X+
-
=
-
,
x=
;
(6)x÷(1-
)=
,
x÷
×
=
×
,
x=
.
| 2 |
| 15 |
| 1 |
| 10 |
| 2 |
| 25 |
| 1 |
| 30 |
| 1 |
| 30 |
| 2 |
| 25 |
| 1 |
| 30 |
x=2.4;
(2)7x÷
| 1 |
| 5 |
| 1 |
| 2 |
7x÷
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
7x÷7=
| 1 |
| 10 |
x=
| 1 |
| 70 |
(3)
| 8 |
| 9 |
| 1 |
| 3 |
| 35 |
| 36 |
| 5 |
| 9 |
| 35 |
| 36 |
| 5 |
| 9 |
| 5 |
| 9 |
| 35 |
| 36 |
| 5 |
| 9 |
x=1.75;
(4)x-15%x=37.4,
85%x÷85%=37.4÷85%,
x=44;
(5)X+
| 1 |
| 4 |
| 5 |
| 8 |
X+
| 1 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
| 1 |
| 4 |
x=
| 3 |
| 8 |
(6)x÷(1-
| 5 |
| 9 |
| 4 |
| 5 |
x÷
| 4 |
| 9 |
| 4 |
| 9 |
| 4 |
| 5 |
| 4 |
| 9 |
x=
| 16 |
| 45 |
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