rút gọn B=x^2+y^2-z^2+2xy/x^2+z^2-y^2+2xz
C=(2x+3)^2-x^2/x^2-1
D=x^3-3x^2-x+3/x^2-3x
E=4x^3-8x^2+3x-6/12x^3+4x^2+9x+3
F=(3x+2)^2-(x+2)^2/X^3-x^2
G=10xy^2(2x-1)^3/12x^3y(1-2x)
H=x^5+x^3+x^2+1/x^3+x^2+x+1
K=x^2+7x+12/x^2+5x+6
Loga
Sinh Học lớp 12
