如果定义一种新的运算a⊙b=a+b/1-ab,试计算1/2⊙1/5的值

问题描述:

如果定义一种新的运算a⊙b=a+b/1-ab,试计算1/2⊙1/5的值

1/2⊙1/5
=(1/2+1/5)/[1-(1/2)*(1/5)]
=1(/2+1/5)/[1-(1/10)]
=7/9