Question

Знайди рівності, які є тотожністю. 1) x⋅(−u)=−xu 2) (−x):(−u)=x:u 3) x−u=u−x 4) тx−u=x+(−u) 5) x−(−u)=x+u

Answer 1

Ответ:

Правильный ответ , в только 3. он и есть тотожный

Answer 2

1) x⋅(−u) = −xu This equation is an example of the distributive property of multiplication over addition. The left side of the equation can be rewritten as -xu. So both sides of the equation are equal. 2) (−x):(−u) = x:u This equation is an example of the rule for dividing negative numbers. When you divide two negative numbers, the result is positive. So both sides of the equation are equal. 3) x−u = u−x This equation is an example of the commutative property of addition. In mathematics, the order in which numbers are added does not change the result. So both sides of the equation are equal. 4) tx−u = x+(−u) This equation is an example of combining like terms. The left side of the equation can be simplified to (t-1)x. The right side can be simplified to x-u. So both sides of the equation are equal. 5) x−(−u) = x+u This equation is an example of the double negative property. When you subtract a negative number from a positive number, it is the same as adding the positive number. So both sides of the equation are equal.