题目内容
解方程
(1)18%:
=
(2)2(Χ+1)=1-(Χ-4)
(1)18%:
| 3 |
| 20 |
| Χ |
| 6.5 |
(2)2(Χ+1)=1-(Χ-4)
(1)18%:
=
,
x=18%×6.5,
x×
=1.17×
,
x=7.8;
(2)2(x+1)=1-(x-4),
2x+2=1-x+4,
2x+2=5-x,
2x+2+x=5-x+x,
3x+2-2=5-2,
3x÷3=3÷3,
x=1.
| 3 |
| 20 |
| Χ |
| 6.5 |
| 3 |
| 20 |
| 3 |
| 20 |
| 20 |
| 3 |
| 20 |
| 3 |
x=7.8;
(2)2(x+1)=1-(x-4),
2x+2=1-x+4,
2x+2=5-x,
2x+2+x=5-x+x,
3x+2-2=5-2,
3x÷3=3÷3,
x=1.
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