题目内容
解方程
+4ⅹ=
x=
÷
2x-20%x=36.
| 1 |
| 5 |
| 4 |
| 5 |
| 3 |
| 4 |
| 8 |
| 9 |
| 2 |
| 3 |
2x-20%x=36.
(1)
+4x=
,
-
+4x=
-
,
4x=
,
4x÷4=
÷4,
x=
×
,
x=
;
(2)
x=
÷
,
x=
×
,
x÷
=
×
÷
,
x=
×
×
,
x=
;
(3)2x-20%x=36,
(2-20%)x=36,
1.8x=36,
1.8x÷1.8=36÷1.8,
x=20.
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
4x=
| 3 |
| 5 |
4x÷4=
| 3 |
| 5 |
x=
| 3 |
| 5 |
| 1 |
| 4 |
x=
| 3 |
| 20 |
(2)
| 3 |
| 4 |
| 8 |
| 9 |
| 2 |
| 3 |
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 2 |
| 3 |
| 4 |
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 2 |
| 3 |
| 4 |
x=
| 8 |
| 9 |
| 3 |
| 2 |
| 4 |
| 3 |
x=
| 16 |
| 9 |
(3)2x-20%x=36,
(2-20%)x=36,
1.8x=36,
1.8x÷1.8=36÷1.8,
x=20.
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