5⼀18×9÷5⼀18×27 7⼀9÷6⼀5+2⼀9÷6⼀5 【1-(1⼀3+1⼀9)】÷25⼀36

共三道脱式计算,高手帮帮我,谢谢了!
2024-12-02 04:30:41
推荐回答(1个)
回答1:

为了表达清楚,我增加了括号:
(5/18)×9÷(5/18)×27
=(5/18)×9×(18/5)×27
=9×27
=243

(7/9)÷(6/5)+(2/9)÷(6/5)
=(7/9)×(5/6)+(2/9)×(5/6)
=[(7/9)+(2/9)]×(5/6)
=1×(5/6)
=5/6

{1-[(1/3)+(1/9)}÷(25/36)
={1-(4/9)}×(36/25)
=(5/9)×(36/25)
=4/5