题目内容
解方程.
(1)
x+
x=
(2)x-
x=28
(3)
-2x=
.
(1)
| 1 |
| 2 |
| 2 |
| 5 |
| 81 |
| 100 |
(2)x-
| 3 |
| 7 |
(3)
| 15 |
| 16 |
| 1 |
| 4 |
(1)
x+
x=
x=
x÷
=
÷
x=
;
(2)x-
x=28
x=28
x÷
=28÷
x=49;
(3)
-2x=
-2x+2x=
+2x
-
=
+2x-
÷2=2x÷2
x=
.
| 1 |
| 2 |
| 2 |
| 5 |
| 81 |
| 100 |
| 9 |
| 10 |
| 81 |
| 100 |
| 9 |
| 10 |
| 9 |
| 10 |
| 81 |
| 100 |
| 9 |
| 10 |
x=
| 9 |
| 10 |
(2)x-
| 3 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
x=49;
(3)
| 15 |
| 16 |
| 1 |
| 4 |
| 15 |
| 16 |
| 1 |
| 4 |
| 15 |
| 16 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 11 |
| 16 |
x=
| 11 |
| 32 |
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