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Giúp Én 2 câu n ày nha

Én siu ngu toán nên ko bít làm

x : 2/3 - 3/5 = -7/2

x- 20/11.13 - 20/13.15 -...-20/53.55 = 3/11

a)

\(\Leftrightarrow yz=z^2+2z+3\Leftrightarrow z\left(y-2-z\right)=3\)

\(\hept{\begin{cases}z=\left\{-3,-1,1,3\right\}\\y-2-z=\left\{-1,-3,3,1\right\}\end{cases}\Rightarrow\hept{\begin{cases}x=\left\{-2,0,2,4\right\}\\y=\left\{-2,-4,6,6\right\}\end{cases}}}\)