一张长100厘米的长方形铁皮按图裁剪，正好能制成一只铁皮水桶，求所制成的水桶的容积（结果用含π的式子表示）．
递等式计算+= +=﹣= ﹣=1﹣= +﹣=1﹣+．
直接写出得数．= = == = 1﹣=
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25×8=8.5﹣3.7=0.56÷0.07=4×9.2×0.25======
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