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123xx123+77xx77+2xx123xx77=?

Answer»

SOLUTION :`123xx123+77xx77+2xx123xx77`
`=(123)^2+(77)^2+2xx123xx77`
`=(123+77)^2 [(a+b)^2=a^2+b^2+2ab]`
`=(200)^2=40000`


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