练习三(2)第1题答案
练习三(2)第2题答案
12.56÷3.14÷2=2
3.14×22x100
=3.14×4x100
=1256
练习三(2)第3题答案
(1)6÷2=3
3.14×32x12
=3.14×9x12
= 399.12
(2)3.14x6x12+3.14x32x2
=3.14x6x12+3.14x9x2
=226.08+56.52
=282.6
练习三(2)第4题答案
⑴ 62.8÷2÷3.14=10
3.14x102+62.8x6
=3.14x100+62.8x6
=314+376.8
=690.8 690.8x3=2072.4
⑵ 3.14x102x6x1
=3.14x100x6x1
=1884吨
练习三(2)第5题答案
5024÷3.14÷102
=5024÷3.14÷100
=16
练习三(2)第6题答案
4÷2=2
3.14×22x10x1/5x3
=3.14×4x10x1/5x3
=75.36 ≈75