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If 1/(x+ 1/(y+ 1/z)) = 13/30, then find x+y+z= ?

If x + y = 2 and 1/x + 1/y = 18/15, then find the value of (x³ + y³)?

If x = (√13 + √12)/ (√13 - √12) and y = (√13 - √12)/(√13 + √12), then find the value of 4x² – xy + 4y².

If a, b and c are integers such that a ²  + b ²  + c ²  = 228, a + b + c = 26 and b = c, then find the value of a?

If a = 901, b= 903, and c= 906, then find the value of a³ + b³ +c³ –3abc?

ABCD is a cyclic quadrilateral in which AB =16.5 cm. BC = x cm. CD= 11 cm. AD 19.8 cm, and BD is bisected by AC at O. What is the value of x?

Solve: 1/x + 1/y = 5/2 and 1/x – 1/y = 1/6

if a² + b² + c² = 2(4a -5b -6c)-77 , then a-b-c = ?