please solve question no 7
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a^3+b^3=(a+b)(a^2-ab+b^2)
so,
=(361+139){(361)^2-361×139 + (139)^2}÷(361)^2-361×139 + (139)^2
by cancellation we get,
=361+139
=500
so,
=(361+139){(361)^2-361×139 + (139)^2}÷(361)^2-361×139 + (139)^2
by cancellation we get,
=361+139
=500
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