1)- PTTNT
a) 2x^2-6x b) x^2-y^2+6y-9 c) 3x(x-2y)+6y(2y-x)
d) x^3-4x^2-8x+8 e) a^2+b^2+2ab+2a+2b+1 f) x^2-7x+12
g) (x+1)(x+2)(x+3)(x+4)-8
2)tìm x
a) x^2+3x-18=0 b)8x^2+30x+7=0
Loga
Sinh Học lớp 12
