bai 1
a,(2x-5)(3x+7)
b,5x(4x^2-2x+1)-2x(10x^2-5x+2)
c,(x-3y)^2-2(x-3y)(x+3y)+(x+3y)^2
d,(6x^3-x^2-1):(3x^2+2x+1)
bai 1 a,(2x-5)(3x+7) b,5x(4x^2-2x+1)-2x(10x^2-5x+2) c,(x-3y)^2-2(x-3y)(x+3y)+(x+3y)^2 d,(6x^3-x^2-1):(3x^2+2x+1)
By Jasmine
By Jasmine
bai 1
a,(2x-5)(3x+7)
b,5x(4x^2-2x+1)-2x(10x^2-5x+2)
c,(x-3y)^2-2(x-3y)(x+3y)+(x+3y)^2
d,(6x^3-x^2-1):(3x^2+2x+1)
a,(2x-5)(3x+7)=6x^2-1x+35
b,5x(4x^2-2x+1)-2x(10x^2-5x+2)=20x^3-10x^2+5x-(20x^3-10x^2+4x)
=1x
tui chỉ có lm dc 2 câu a và b thui nha