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5х 2 – 5у 2 ; х 5 – х 7 ; 3а 2 + 6а b + 3b 2 ; 7 + 7a 3 ; 15cx + 2cy – cxy – 30c; x 4 – 5x 2 +4. 5(x – y)(x + y); x 5 (1 – x)(1 + x); 3(a + b) 2 ; 7(1+a)(1 – a + a 2) ; (15cx-cxy)+(2cy-30c)= cx(15-y)+2c(y-15)=(15 –y)(cx-2c);
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5х2 – 5у2; х5 – х7; 3а2 + 6аb + 3b2; 7 + 7a3; 15cx + 2cy – cxy – 30c; x4 – 5x2 +4. 5(x – y)(x + y); x5(1 – x)(1 + x); 3(a + b)2; 7(1+a)(1 – a + a2); (15cx-cxy)+(2cy-30c)= cx(15-y)+2c(y-15)=(15 –y)(cx-2c); x4 - 4x2 –x2 +4 =(x4-4x2) –(x2-4)=x2(x2-4)-(x2-4)= (x-2)(x+2)(x-1)(x+1) Розкласти на множники