1) x^10-4x^8+4x^6=x^6(x^2−2)^2
2)m^3+27=(m+3)^3
3)x^3+8=(x+2)^3
4) 1/27+a^3=(1/3+a)^3
5) 8x^3+27y^3=(2x)^3+(3y)^3= (2x - 3y) . (4x^2 + 6xy + 9y^2)
6) 1/8x^3+8y^3=(1/2x)^3+(2y)^3=(1/2x-2y).(x^2+2xy+4y^2)
7) 8x^6-27y ³= (2x^2)^3 - (3y)^3 = ( 2x^2 - 3y) (4x^4 + 6x^2.y + 9y^2)
8) 1/8x ³-8=(1/2x)^3-2^3=(1/2x-2)(1/4x^2+x+4)
9) 1/64x^6-125y ³= ( 1 4 x ^2 )^3 − ( 5 y )^3 = ( 1/ 4 . x^2−5. y ) ( 1/16.x^4 + 5/4x^2y + 25y^2 )
10) (a+b) ³-c ³
12) x^9+1 = ( x^3 )^3 + 1
= ( x^3 + 1 ) ( x^6 − x^3 + 1 )
= ( x + 1 ) ( x^2 − x + 1 ) ( x^6 − x^3 + 1 )
= x^3 ( x + 1 ) ( x^2 − x + 1 ) ( x^2 − x + 1 )
câu10 với câu12 mìn ko biết làm
cho mình câu tra lời hay nhất nha
good luck ^.^
