If the meaning of * is a * b = (a + b) / AB, find the value of 2 * (- 4) * 3! I can't understand the meaning! Is 2 * (- 4) equal to 2 + (- 4) / 8? Then the result is multiplied by 3?

If the meaning of * is a * b = (a + b) / AB, find the value of 2 * (- 4) * 3! I can't understand the meaning! Is 2 * (- 4) equal to 2 + (- 4) / 8? Then the result is multiplied by 3?

It's not - 2 × 4 = - 8. You have the wrong denominator and the others are right

The cube of 5xy - {the square of 2XY - [the square of 3xy - (the square of 4xy - the square of 2XY)]}
Where x = 2, y = 1

Original formula = 5xy ^ 3 - (2XY ^ 2-xy ^ 2)
=5xy^3-xy^2
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(- 2XY) square and_; (- 3xy Square) cube

Solution
(- 2XY) square and_; (- 3xy Square) cube
=(4x^2y^2)×(-27x^3y^6)
=-108x^5y^8

2Y squared - 3y-2 = 0, 1 / 2Y squared + 1 / 4Y = 3 / 2

(2y+1)(y-2)=0
Y = - 1 / 2 or y = 2
Go to the denominator and get 2Y ^ 2 + y-6 = 0
(2y+3)(y-2)=0
Y = - 3 / 2 or y = 2