苏教版六年级下册数学练习与测试答案第33页

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5: 12.56÷3.14÷2=2
1/3×2

×3.14×0.9÷0.3
=1/3×4×3.14×0.9÷0.3
=13
6: 10

×3.14×4
   =100×3.14×4
=1256

7： 40cm=4dm       50cm=5dm
      4÷2=2
      2

×3.14×5÷0.5
   =4×3.14×5÷0.5
   =125

8： ①    30cm=0.3m
               3.14×16×0.3
            =15.072

      ② 16÷2=8
            8

×3.14×0.3=
=64×3.14×0.3
=60.288