题目内容
解方程.
x=
x÷12=
4x-2(8+x)=
.
| 8 |
| 21 |
| 4 |
| 15 |
| 2 |
| 3 |
| 1 |
| 4 |
4x-2(8+x)=
| 1 |
| 2 |
(1)
x=
,
x÷
=
÷
,
x=
;
(2)
x÷12=
,
x÷12×12=
×12,
x÷
=3÷
,
x=4.5;
(3)4x-2(8+x)=
,
4x-16-2x=
,
2x-16+16=
+16,
2x÷2=16.5÷2,
x=8.25.
| 8 |
| 21 |
| 4 |
| 15 |
| 8 |
| 21 |
| 8 |
| 21 |
| 4 |
| 15 |
| 8 |
| 21 |
x=
| 7 |
| 10 |
(2)
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=4.5;
(3)4x-2(8+x)=
| 1 |
| 2 |
4x-16-2x=
| 1 |
| 2 |
2x-16+16=
| 1 |
| 2 |
2x÷2=16.5÷2,
x=8.25.
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