What proberty is a=1a and also 3-3×=3(1-×)

The first one,

 is the multiplicative identity property.

The identity element of multiplication of real numbers is 1.

This means that if you multiply any real number by you get the same real number.

The second one,

is the distributive of property of multiplication over subtraction.

a = 1a ---> multiplicative identity property of 1

3 - 3x = 3 (1 - x) ---> distributive property of multiplication (over subtraction)

Step-by-step explanation:

a = 1a holds the the multiplicative identity property of 1.

This property of identity states that whenever you multiply any number with 1, the result is same as the original number. It means that 1 has no effect when multiplied with any number.

3 - 3x = 3 (1 - x) holds the distributive property of multiplication (over subtraction)

This distributive property is used to multiply a single term with two or more terms inside the brackets or you can say the equations which are in the form a (b + c).

Its main purpose is to expand the terms by first multiplying each term inside the bracket with the term outside the term and then adding/subtracting the like terms together.