☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( ☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( )后面挂号里应该填什么数,
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☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( ☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( )后面挂号里应该填什么数,
☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =(
☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( )后面挂号里应该填什么数,
☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( ☆表示一种新的运算符号,并且规定a☆b =(a +b)/(a-b),那么(72☆56)☆6 =( )后面挂号里应该填什么数,
(72☆56)☆6
=[(72+56)/(72-56)]☆6
=8☆6
=(8+6)/(8-6)
=14/2
=7
((72+56)/(72-56)+6)/((72+56)/(72-56)-6) =7
是7
8
=(72+56)/(72-56)☆6
=8☆6
=(8+6)/(8-6)
=14/2
=7
7
((72+56)/(72-56)+6)/((72+56)/(72-56)-6) =7