题目内容
解方程.
(1)18:
=
(2)2(x+1)=1-(x-4)
(1)18:
| 3 |
| 20 |
| x |
| 6.5 |
(2)2(x+1)=1-(x-4)
(1)18:
=
,
x=18×6.5,
x÷
=117÷
,
x=780;
(2)2(x+1)=1-(x-4),
2x+2=5-x,
2x+2+x=5-x+x,
3x+2=5,
3x+2-2=5-2,
3x=3,
3x÷3=3÷3,
x=1.
| 3 |
| 20 |
| x |
| 6.5 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 20 |
x=780;
(2)2(x+1)=1-(x-4),
2x+2=5-x,
2x+2+x=5-x+x,
3x+2=5,
3x+2-2=5-2,
3x=3,
3x÷3=3÷3,
x=1.
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