一个圆形游泳池的半径是50 米，绕游泳池跑一圈是多少米？游泳池的占地面积是多少平方米？
直接写出得数．= = = == = = =
口算．= = 5﹣= =0×1= 1÷= = =
直接写得数．= = = == = = =
直接写得数+= ÷7= ×= ÷=×8= 9÷= 15×= ﹣=÷= ×= ×= ÷=
直接写出得数．+= ×= ÷6= ×8= +=2﹣= 0+= ÷= 1÷= ﹣=
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= 5﹣
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= 1÷
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+
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÷7= 
×
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÷
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×8= 9÷
= 15×
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﹣
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÷
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×
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÷
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+
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×
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÷6= 
×8= 
+
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= 0+
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÷
= 1÷
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﹣
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