练习四1.作业精灵老师示例:底面半径/cm底面直径 /cm底面周长/ cm高/ cm体积/立方厘米圆锥3618.84547.1圆锥0.513.1430.785圆锥91856.522169.562. 25.12÷3.14÷2=4(米) 1/3x 3.14x42x1.2x0.75 =1/3x 3.14x16x1.2x0.75 =15.072(吨)15.072吨 ≈15.1吨答:这堆小麦大约重15.1吨。3. 6÷2=3(厘米) 3.14x32x20+1/3x3.14x32x4 =3.14x9x20+1/3x3.14x9x4 =565.2+3 |