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If a new operation is defined as a * b = AB / 1-ab, what is the value of [(3 * 2)] * 1 / 6?
-6
Define a new operation, a * b = (a + b) / (1-ab), please calculate the value of [(1 / 2 * 1 / 5)] * (- 1)
（1/2*1/5)=（1/2+1/5)/(1-1/10)=7/9
7/9*（-1）=(7/9-1)/(1+7/9)=-1/8
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