2 câu trả lời
Đáp án:
-(2x-y)^3
= -[(2x)^3 - 3*(2x)^2*y + 3*2x*y^2-y^3]
= - (8x^3 - 12x^2y+6xy^2-y^3)
-(2x-y) ³
= (2x+y) ³
= (2x)³ + 3 ×(2x)² × y + 3 × 2x × y ² +y ³
= 8x ³ + 12x²y + 6xy² + y ³
Đáp án:
-(2x-y)^3
= -[(2x)^3 - 3*(2x)^2*y + 3*2x*y^2-y^3]
= - (8x^3 - 12x^2y+6xy^2-y^3)
-(2x-y) ³
= (2x+y) ³
= (2x)³ + 3 ×(2x)² × y + 3 × 2x × y ² +y ³
= 8x ³ + 12x²y + 6xy² + y ³