If a + b + c = 0, then (a+b)²/ab + (b+c)²/bc + (c+a)²/ac is equal to : 1. 0 2. 1 3. 3 4. abc

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The value of (−28)³ + (18)³ + (10)³ is
15120
-15120
-5040
none of these

If x + y = −4, the value of x³ + y³ − 12xy + 64 is :
1
-1
4
0