(31+1/3)*(41+1/2)-(11+1/3)*(41+1/2)*2-(9+1/2)*(11+1/3)

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(31+1/3)*(41+1/2)-(11+1/3)*(41+1/2)*2-(9+1/2)*(11+1/3)
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(31+1/3)*(41+1/2)-(11+1/3)*(41+1/2)*2-(9+1/2)*(11+1/3)
(31+1/3)*(41+1/2)-(11+1/3)*(41+1/2)*2-(9+1/2)*(11+1/3)

(31+1/3)*(41+1/2)-(11+1/3)*(41+1/2)*2-(9+1/2)*(11+1/3)
=(31+1/3)*(41+1/2)-(11+1/3)*(41+1/2)-(11+1/3)*(41+1/2)-(9+1/2)*(11+1/3)
=[(31+1/3)-(11+1/3)]*(41+1/2)-[(41+1/2)+(9+1/2)]*(11+1/3)
=20*(41+1/2)-51*(11+1/3)
=820+10-561-17=252