Nhân 2 đơn thức
\(a,=x^7\\ b,=8x^7\\ c,=6x^5y^7\\ d,=-10a^6b^5c^3\)
BT áp dụng:
\(a,=10x^5\\ b,=-18a^3b^9\\ c,=-8x^6y^5z\\ d,=15a^6b^4c^3\\ e,=-8x^3y^4\)
Bài 1:
a) \(x^3.x^4=x^7\)
b) \(2x^2.4x^5=8x^7\)
c) \(3x^2y^3.2x^3y^4=6x^5y^7\)
d) \(-2a^2b^4c.5a^4bc^2=-10a^6b^5c^3\)
Bài 2:
a) \(2x^3.5x^2=10x^5\)
b) \(-6a^2b^4.3ab^5=-18a^3b^9\)
c) \(4x^4y^2.\left(-2x^2y^3z\right)=-8x^6y^5z\)
d) \(-5a^5bc^2.\left(-3ab^3c\right)=15a^6b^4c^3\)
e) \(8x^2y\left(-xy^3\right)=-8x^3y^4\)
a: \(x^3\cdot x^4=x^7\)
b: \(2x^2\cdot4x^5=8x^7\)
c: \(3x^2y^3\cdot2x^3y^4=6x^5y^7\)
d: \(-2a^2b^4c\cdot5a^4bc^2=-10a^6b^5c^3\)