Question

(3a)²x(-a³)

(-3a)² x(2a² -a-3)
a²(a² +a+1)-a(a³ -1)
(1/2 ab+a² -b²)x 2ab-(-ab)²
(-3/4 x² y-3/5xy²)x (-2/3 xy)²

Answer 1

(-3a)² ×(2a² -a-3)=18a^4-9a^3-27a^2
a²(a² +a+1)-a(a³ -1)=a^3+a^2+a
(1/2 ab+a² -b²)× 2ab-(-ab)²=2ab(a^2-b^2)
(-3/4 x² y-3/5xy²)×(-2/3 xy)² =-1/3x^4y^3-4/15x^3y^4
a^4表示a的四次方,其他类似.