(1) | (2) | (3) | (4) |
C | A | B | C |
图一: 3.14x3-3.14x2
=3.14x9-3.14x4
=3.14x5
=15.7
|
图二:8÷2=4
3.14x4÷2+8x4
= 3.14x16÷2+8x4
=25.12+32
=57.12
|
图三:(6+12)×3÷2-3²×3.14÷2
=18×3÷2-9×3.14÷2
=27-14.13
=12.87
|