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5.01001000100001... is not a rational number. Rational numbers will always repeat when written in a digital form. Since it is not rational, it cannot be written as a fraction with integer numerator and denominator.
1.8 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 equivalent, in rational form, is 18/10. You can simplify this rational fraction if required.
2.4 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 equivalent, in rational form, is 24/10. You can simplify this rational fraction if required.
43.75 = 4375/100, which is a number in ratio form. It can be simplified if desired.
-12 IS a rational form.