№4
а) 121y²-(y+9)²= (11y)²-(y+9)²=(11y-y-9)*(11y+y+9)= (10y-9)*(12y+9)
б) 64a³+(2-a)³= (4a)³+(2-a)³= (4a+2-a)*((4a)²-4a*(2-a)+(2-a)²
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№4
а) 121y²-(y+9)²= (11y)²-(y+9)²=(11y-y-9)*(11y+y+9)= (10y-9)*(12y+9)
б) 64a³+(2-a)³= (4a)³+(2-a)³= (4a+2-a)*((4a)²-4a*(2-a)+(2-a)²