Bài 1: Làm tính nhân
a, (x ² + 2x+1)(x+3)
b, (3a+2b)(9a – 6ab+ab ²)
c, (5x ² – 6y ²)(6x ² – 5y ²)
Bài 2 : Làm tính nhân
a,(x-y)(x ²+xy+y ²)
b,(x ² – 2xy + y ² )(x-y)
c, (5x ² – 2xy ²+ y ²)(-x ³ – 2x ²y+ 5xy ²)
d, (2x – y)(4x ² + 2xy + y ²)(8x ³+y ³)
a,(x²+2x+1)(x+3)
=x³+3x²+2x²+6x+x+3
b,(3a+2b)(9a-6ab+ab²)
=27a²-18a²b+3a²b²+18ab-12ab²+2ab³
c,(5x²-6y²)(6x²-5y²)
=30x^4-25x²y²-36x²y²+30y^4
=30x^4-61x²y²+30y^4
Bài 2 : Làm tính nhân
a,(x-y)(x²+xy+y²)
=x³+x²y+xy²-x²y-xy²-y³
b,(x²-2xy+y²)(x-y)
=x³-x²y-2x²y+2xy²+xy²+y³
=x³-3x²y+3xy²+y³
c,(5x²-2xy²+y²)(-x³-2x²y+5xy²)
=-5x^5-10x^4y+2x^4y²+4x³y³-10x²y^4+5xy^4
d,(2x-y)(4x²+2xy+y²)(8x³+y³)
=(8x³+4x²+2xy²-4x²y-2xy²-y^4)(8x³+y³)
=64x^6+8x³y³+32x^5+4x²y³+16x^4y²+2xy^5-32x^5y-4x²y^5-16x^5y²-2xy^5-8x³y^4-y^7
Nocopy
Xin câu trả lời hay nhất
Bài 1 : Làm tính nhân
a,(x²+2x+1)(x+3)
=x³+3x²+2x²+6x+x+3
b,(3a+2b)(9a-6ab+ab²)
=27a²-18a²b+3a²b²+18ab-12ab²+2ab³
c,(5x²-6y²)(6x²-5y²)
=30x^4-25x²y²-36x²y²+30y^4
=30x^4-61x²y²+30y^4
Bài 2 : Làm tính nhân
a,(x-y)(x²+xy+y²)
=x³+x²y+xy²-x²y-xy²-y³
b,(x²-2xy+y²)(x-y)
=x³-x²y-2x²y+2xy²+xy²+y³
=x³-3x²y+3xy²+y³
c,(5x²-2xy²+y²)(-x³-2x²y+5xy²)
=-5x^5-10x^4y+2x^4y²+4x³y³-10x²y^4+5xy^4
d,(2x-y)(4x²+2xy+y²)(8x³+y³)
=(8x³+4x²+2xy²-4x²y-2xy²-y^4)(8x³+y³)
=64x^6+8x³y³+32x^5+4x²y³+16x^4y²+2xy^5-32x^5y-4x²y^5-16x^5y²-2xy^5-8x³y^4-y^7
Chúc bn hc tốt^^