a) \(2\left(x+y\right)=120\Rightarrow x+y=60\left(1\right)\Rightarrow\) Sai
b) \(\left(x+5,5\right)\left(y+3,2\right)\left(m^2\right)\Rightarrow\) Đúng
c) \(\left(x+5,5\right)\left(y+3,2\right)-xy=244,1\Leftrightarrow3,2x+5,5y=226,5\left(2\right)\)
\(\left(1\right);\left(2\right)\Rightarrow\left\{{}\begin{matrix}x=45\\y=15\end{matrix}\right.\) \(\Rightarrow\) Đúng
d) Diện tích khu vườn lúc sau :
\(\left(45+5,5\right).\left(15+3,2\right)=50,5.18,2=918,1\left(m^2\right)\Rightarrow\) Sai
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