问题 解答题
巧解密码!
(1)18%:
3
20
=
x
6.5
(2)3×(x+0.9)=5×(x-1.7)
答案

(1)18%:

3
20
=
x
6.5

3
20
x=18%×6.5,

3
20
x÷
3
20
=1.17÷
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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