expand ( 5x+3y)³ by algebraic formulae
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Find the mean of first five prime numbers
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formula =(a+b)³=a³+b³+3ab(a+b)
(5x+3y)³=(5x)³+(3y)³+3(5x)(3y)(5x+3y)
=125x³+27y³+45xy(8xy)
=125x³+27y³+360x²y²
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