Ph©n tÝch ®a thøc sau thµnh nh©n tö: 1/ 7x + 7y 2/ 2x 2 y – 6xy 2 3/ 3x(x – 1) + 7x 2 ( x – 1) 4/ 3x(x – a) + 5a(a – x) 5/ 6x 4 – 9x 3 6/ 5y 10 + 15y 6 7/ 9x 2 y 2 + 15x 2 y – 21xy 2 8/ x 2 y 2 z + xy 2 z 2 + x 2 yz 2 9/ x 2 - 2 10/ x 2 – 6xy + 9y 2 11/ x 3 – 64 12/ 125x 3 + y 6 13/ 0,125(a + 1) 3 – 1 14/ 81x 4 + 4 15/ 2x(x+1) + 2(x+1) 16/ y 2 (x 2 + y) – zx 2 – zy 17/ 4x(x – 2y) + 8y(2y – x) 18/ 3x(x + 1) 2 – 5x 2 (x + 1) + 7(x + 1) 19/ 2x + 1) 2 – (x – 1) 2 20/ 9(x + 5) 2 – (x – 7) 2 21/ 25(x – y) 2 – 16(x + y) 2 22/ 49(y – 4) 2 – 9(y + 2) 2 23/ x 4 + x 3 + x + 1 24/ x 4 - x 3 – x 2 + 1 25/ x 2 y + xy 2 – x – y 26/ ax 2 + a 2 y – 7x – 7y 27/ ax 2 + ay – bx 2 - by 28/ x(x + 1) 2 + x(x – 5) – 5(x + 1) 2 29/ 3x 2 – 12y 2 30/ 5xy 2 – 10xyz + 5xz 2 31/ x 3 + 3x 2 + 3x + 1 – 27z 3 32/ x 2 – 2xy + y 2 – xz + yz 33/ x 2 – y 2 – x + y 34/ a 3 x – ab + b – x 35/ 3x 2 (a + b + c) + 36xy(a + b + c) + 108y 2 ( a + b + c) 36/ ab(a – b) + bc(b – c) + ca(c – a) 37/ (a + b + c) 3 – a 3 –b 3 – c 3 38/ 4a 2 b 2 – (a 2 + b 2 – c 2 ) 2 39/ (1 + x 2 ) 2 – 4x(1 – x 2 ) 40/ (x 2 - 8) 2 + 36