解:
可以这样填:
(500.1)≈500≈(500.2)
(500.2)≈500≈(500.3)
(500.12)≈500≈(500.21)(500.112)≈500≈(500.121)(500.123)≈500≈(500.124)(500.132)≈500≈(500.221)(500.124)≈500≈(500.251)(500.16)≈500≈(500.20)(500.172)≈500≈(500.230)(500.182)≈500≈(500.211)
等等多种填法。
解:
可以这样填:
(500.1)≈500≈(500.2)
(500.2)≈500≈(500.3)
(500.12)≈500≈(500.21)(500.112)≈500≈(500.121)(500.123)≈500≈(500.124)(500.132)≈500≈(500.221)(500.124)≈500≈(500.251)(500.16)≈500≈(500.20)(500.172)≈500≈(500.230)(500.182)≈500≈(500.211)
等等多种填法。