题目内容
巧解密码!
(1)18%:
=
(2)3×(x+0.9)=5×(x-1.7)
(1)18%:
| 3 |
| 20 |
| x |
| 6.5 |
(1)18%:
=
,
x=18%×6.5,
x÷
=1.17÷
,
x=7.8;
(2)3×(x+0.9)=5×(x-1.7),
3x+2.7=5x-8.5,
3x+2.7+8.5=5x-8.5+8.5,
3x+11.2-3x=5x-3x,
11.2÷2=2x÷2,
x=5.6.
| 3 |
| 20 |
| x |
| 6.5 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 20 |
x=7.8;
(2)3×(x+0.9)=5×(x-1.7),
3x+2.7=5x-8.5,
3x+2.7+8.5=5x-8.5+8.5,
3x+11.2-3x=5x-3x,
11.2÷2=2x÷2,
x=5.6.
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