a)
\(=\left(3-xy^2-2+xy^2\right)\cdot\left(3-xy^2+2+xy^2\right)\)
\(=1.5=5\)
b)
\(=\left(3x\right)^2-\left(3x-1\right)^2\)
\(=\left(3x-3x-1\right)\cdot\left(3x+3x-1\right)\)
\(=-1\cdot6x-1\)
c)
\(\left(a-b^2\right)\cdot\left(a+b^2\right)\)
\(=a^2-b^4\)
d)
\(\left(a^2+2a+3\right)\cdot\left(a^2+2a-3\right)\)
\(=\left(a^2+2a\right)^2-3^2\)
\(=\left(a^2+2a\right)^2-9\)
e)
ban xem lai de nhe
f)
\(=y^2-\left(2z-3\right)^2\)
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