1B.
a.
\(=\frac{-2}{5}x^2.\frac{5}{3}x^4+\frac{2}{5}x^2.\frac{2}{3}x^2-\frac{2}{5}x^2.\frac{15}{8}\)
\(=\frac{-2}{3}x^6+\frac{4}{15}x^4-\frac{3}{4}x^2\)
b.
\(=\frac{1}{3}xy^23x^2y-\frac{1}{3}xy^26x^3+\frac{1}{3}xy^2.y^2\)
\(=x^3y^3-2x^4y^2+xy^4\)
c.
\(=-\frac{1}{8}x^6(x^2-8x+4)=-\frac{1}{8}x^8+x^7-\frac{1}{2}x^6\)
d.
\(=4x^2y^2(x^3-3xy-\frac{1}{4}x^2)\)
\(=4x^5y^2-12x^3y^3-x^4y^2\)
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