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+10(y²)1³+5(y)1^4+1^5
=y^5+5y^4+10y³+10y²+
5y+1
2.-3(-x-y)³=-3(-x-y)(-x-y)(-x-y)
=3x+3y(x²+xy+xy+y²)
=3x+3y(x²+2xy+y²)
=3x³+6x²y+3xy²+3x²y+
6xy²+3y³
maaf cuma 2,mau ngerjain pr soalnya..