evaluate usingntity 10.5*9.5
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10.5*9.5
=( 10 + 0.5)(10 - 0.5)
=10^2 - 5 + 5 - 0.25
=( 10 + 0.5)(10 - 0.5)
=10^2 - 5 + 5 - 0.25
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