Sorry if it is not clear the question asks, Two squares of side x cm are removed from a square of side 3x cm as shown

1 answer:

5 0

$(3x)^2-2\cdot x^2=9x^2-2x^2=7x^2\\\\
\frac{7x^2}{9x^2}=\boxed{\frac{7}{9}}$

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