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,长宽,组合图形的面积,3m,5m,2m,3m,8m,5m,3m,5m,2m,3m,8m,5m,32 + 83,= 6 + 24 = 30 (m2), +,35 + 53,= 15+ 15 = 30 (m2),5m,2m,3m,5m,3m,8m, ,85 52,= 40 10 = 30 (m2),答:儿童游乐场的面积有30 m2。,5 ( ) +7 18=( ),12 10+( ) 8=( ),( ) 18 - 5 8=( ),10m,8m,10m,22m,18m,12m, ,2218 108,2m,8m,6m,8m,10m,2m, +,28 + 82,2m,8m,6m,8m,2m, +,26 + 102,10m,2m,8m,6m,8m,10m,2m, ,108 86,20cm,12cm,10cm,5cm, ,2012 105,60 m,40m,5m, ,6040 540,25 cm,35 cm,15 cm,10 cm,?,?,25 cm,35 cm,15 cm,10 cm,?,?,35 cm,15 cm,10 cm, ,3525 1510,25 cm, ,75 33,= 35 9 = 26(dm2),