If 4x & # 178; YZ & # 179; △ B = - 8x, then B =?

If 4x & # 178; YZ & # 179; △ B = - 8x, then B =?

-1/2xyz³

-Which of the numbers 3x & # 178;, 4 π R & # 178;, &# 189;, X / y, X / 5, π D & # 178; / 4 are monomials?
The answer should be 100% correct, the sooner the better

-Which of the numbers 3x & # 178;, 4 π R & # 178;, &# 189;, X / y, X / 5, π D & # 178; / 4 are monomials? Only x / y is not, so is 1 / 2, because 1 / 2 = 1 × 1 / 21

Simplification: [a + b] &# 178; - C & # 178; divided into a & # 178; - [B-C] &# 178;

(a²-(b-c)²)/((a+b)²-c²)
=(a+b-c)(a-b+c)/((a+b+c)(a+b-c))
=(a-b+c)/(a+b+c)