第22页

信息发布者：
B
C
C
C
B
A
=13……10
=4……50
=9……20



​$=270\div (5×6)$​
​$ =270\div 30$​
​$ =9$​
​$=540\div 9\div 4$​
​$ =60\div 4$​
​$ =15$​
​$=450\div 9\div 2$​
​$ =50\div 2$​
​$ =25$​
=270÷(5×6)
=270÷30
=9
=540÷(4×9)
=540÷9÷4
=60÷4
=15
=450÷(9×2)
=450÷9÷2
=50÷2
=25
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