Question

Làm tính nhân : 

a) ( -4xy )( \(2xy^2\)- \(3x^2\)y )

b) ( -5x )( \(3x^3\)+ \(7x^2\)- x )

c) ( \(\frac{1}{2}a^3b^2\)- \(\frac{3}{4}ab^4\) )( \(\frac{4}{3}a^3\)b ) 

d) ( -a^5 x^5 )( -a^6x + \(2a^3x^2\)- \(11ax^5\) )

Answer 1

a/ \(\left(-4xy\right)\left(2xy^2-3x^3y\right)=-8x^2y^3+12x^4y^2\)

b/ \(\left(-5x\right)\left(3x^3+7x^2-x\right)=-15x^4-35x^3+5x^2\)

 

Answer 2

c/ \(\left(\frac{1}{2}a^3b^2-\frac{3}{4}ab^4\right)\left(\frac{4}{3}a^3b\right)=\frac{2}{3}a^6b^3-a^4b^5\)

d/ \(\left(-a^5x^5\right)\left(-a^6x+2a^3x^2-11ax^5\right)=a^{11}x^6-2a^8x^7+11a^6b^{10}\)