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Jiangsu education printing plate fifth grade mathematics supplementary exercise volume one page 89 fifth question seeks the shadow area.
4*5=20 (square centimeter)

4* 10/2=20 (square centimeter)

20+20=40 (square centimeter)

9*9=8 1 (square centimeter)

6*6=36 (square centimeter)

6/2=3 cm

(3+6)*6=54 (square centimeter)

9/2=4.5 cm

4.5*9/2= 18.5 (square centimeter)

54+ 12.5=66.5 (square centimeter)

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