一个水桶的底面是圆形，底面半径是20厘米，这个水桶底面的周长是多少？底面面积是多少？
直接写得数．============
直接写得数．×=×12=×=÷=÷= 9×=÷═÷12=
直接写得数．=== 3.2÷40%=====
直接写出得数．×=﹣= 0÷= 5÷= 70×=
计算 0.62=×= 4×60%= 0×=÷2= 10÷=×3.6= 0.875÷0.125=
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×
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×12=
×
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÷
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÷
= 9×
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÷
═
÷12=
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×
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﹣
= 0÷
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= 70×
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×
= 4×60%= 0×
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÷2= 10÷
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×3.6= 0.875÷0.125=
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