1.

Plllzzzzz answer my question fastFACTORISE IT:​

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Answer:

3

Step-by-step EXPLANATION:

LET z=a²/bc+b²/ca+c²/ab

z=1/abc(a³+b³+c³)

We KNOW that

GIVEN a+b+c=0

then a³+b³+c³=3abc

so z=1/abc*3abc

=3



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