7apower3+56bpower3 find factorisze
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(7a)^3+(56b)^3
a^3+b^3= (a+b)^3+3×a×b(a+b)
(7a)^3+(56b)^3=(7a+56b)^3+3×7a×56b(7a+56b)
= (7a+56b)^3+1176ab( 7a+56b)
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