x = 30 -3 = 27
y= 5^2-3^2 =25-9== 4
z=30^2-15^2 =900-225==25,98
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x = 30 -3 = 27
y= 5^2-3^2 =25-9== 4
z=30^2-15^2 =900-225==25,98