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(1)7➕8=15,15➖7=8,15➖8=7
(2)5✖️8=40,40➗8=5,40➗5=8
(3)3/4➗4/3=9/16,9/16✖️4/3=3/4
(4)2的平方=4,4➗2=2
(5)1/2✖️2=1,1➗1/2=2
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