苏教版五年级下册数学课本第113页整理与练习答案
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4: 3.14×6 =3.14×36 =113.04
5: 3.14×40 =3.14×1600 =5024
6: 周长 3.14×1280=4019.2 面积 ﹙1280÷2﹚×3.14 =640×3.14 =409600×3.14 =1286144
7: 66×3.14×100 =20724cm =207.24m 2072÷207.24≈10
8: 周长 3.14×40=125.6 面积 3.14×﹙40÷2﹚ =3.14×400 =1256 9: 周长 3.14×64+100×2 =200.96+200 =400.96 面积 ﹙64÷2﹚×3.14+100×64 =32×3.14+100×64 =1024×3.14+100×64 =3215.36+6400 =9615.36
10: 15.7×2÷3.14÷2=5 3.14×5÷2 =3.14×25÷2 =39.25 |
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