有甲、乙两个圆柱体，如果甲的高和乙的底面直径一样长，则甲的体积就将减少．现在如果乙的底面直径和甲的高一样长，则乙的体积将增加 倍．
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直接写出得数．== 1﹣= 4﹣=====
计算下面各题．．
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++﹣+﹣+﹣．
．现在如果乙的底面直径和甲的高一样长，则乙的体积将增加 倍．
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