Question

几道整式的乘法题,快来!1.（6×10^8)(7×10^9)(4×10^4)2.(-3ab)(-a^2c)×6ab^23

Answer 1

1..（6×10^8)(7×10^9)(4×10^4) =(6*7*4)*10^21=1.68*10^23

2..(-3ab)(-a^2c)×6ab^2 =18a^4b^3c

3..(-3xy)×5x^2y+6x^2(7/2xy^2-2y^2)

=-15x^3y^2+21x^3y^2-12x^2y^2

=6x^3y^2-12x^2y^2

4..(-ab)^3×(-a^2b)(-a^2b^4c)^2

=a^5b^4*(a^4b^8c^2)=a^9b^12c^2

很高兴为你解决问题!