-5.7 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is -57/10 which cannot be simplified.
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If that's 57/20, it is already in its simplest form.
0.285 = 57/200
12/57 can be simplified to 4/19
It is: 0.57 = 57/100
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