附加题如图，平行四边形ABCD的周长为72厘米，以BC为底，高为10厘米；以CD为底，高为15厘米．那么平行四边形ABCD的面积是多少？
直接写出得数．×= ÷= ÷= 1.8÷= 0.2÷3=÷= ×= ××0= ×÷×= 18÷÷=
你能直接写出下列各题的结果吗？试试看×= ÷= ××= 4.5%= ×12= ÷4= （+）×= = %
计算．× ÷ ÷×× ÷6× ÷7÷．
直接写得数．= 24÷= = == = =
直接写出得数．12×= ÷= 0÷= ﹣= 12×（×）=×= ÷= 20÷= += ×90×=
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= 24÷
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