For each pair of real numbers a≠b,
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For each pair of real numbers a≠b,
define the operationg★as(a★b)=a+b\a-b.
Then the value of((1★2)★3)is( ).
define the operationg★as(a★b)=a+b\a-b.
Then the value of((1★2)★3)is( ).
![For each pair of real numbers a≠b,](/uploads/image/z/19810606-22-6.jpg?t=For+each+pair+of+real+numbers+a%E2%89%A0b%2C)
1★2=(1+2)/(1-2)=-3
-3★3=(-3+3)/(-3-3)=0
-3★3=(-3+3)/(-3-3)=0
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