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(5⁵+2y)³ =(5⁵)³+3(5⁵)²(2y)+3(5⁵)(2y)²+(2y)³
= 5¹⁵+6(5¹⁰)y+12y²(5⁵)+8y³
(6x+3y²)⁴=(6x)⁴+4(6x)³(3y²)+6(6x)²(3y²)²+4(6x)(3y²)³+(3y²)⁴
=1296x⁴+2592x³y²+1944x²y⁴+648xy⁶+81y⁸