Phân tích đã thức thành nhân tử 1) 2x+4xy 2) 3cd-6bd^2 3) (x+3)-2(x+3) 4) (2x+1)-5(2x+1) 5)x2-9 6) 4x²-1 7) 9x²-y² 8)(x - 1) ^ 2 - 9 9) (2x - 1) ^ 2 - 4 10) 25-(x-1)^2 11) 16x ^ 2 - (x + 3) ^ 2 12 ) 5a(x + y) + (x + y) 13) x ^ 2 + 2xy + y 14) x ^ 2 - 4x + 4 15) x ^ 2 + 6x + 9 Tìm x biết 1) 4x ^ 2 + 4x = 0 2) 8x ^ 2 - 4x = 0 3) 5x(x - 3) + 7(x - 3) = 0 4) 2x(x - 3) + 5(x - 3) = 0 5) (x - 5) ^ 2 - (x - 2) = 0
1: =2x(1+2y)
3: =(x+3)(x+1)
4: =(2x+1)(2x+1-5)
=(2x+1)*(2x-4)
=2(x-2)(2x+1)
5: =(x-3)(x+3)
6: =(2x-1)(2x+1)