zhiyuan3yu5
A plate occupies the region D shown in the diagram. ( a square with a square hole). the plate has surface density p(x,y)=9x^2 Find mass m of the plate.
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zhiyuan3yu5
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|dw:1353265298602:dw|
henpen
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\[9\int\limits_{y=-2}^{y=2}\int\limits_{x=-2}^{x=2}x^2dxdy-9\int\limits_{y=-1}^{y=1}\int\limits_{x=-1}^{x=1}x^2dxdy\]
henpen
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Tu comprende?
zhiyuan3yu5
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oui
zhiyuan3yu5
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merci.
henpen
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Excellent