Question

求解一道初一数学题

如果规定@表示一种运算，且a@b=ab份之a-2b，求：3@（4@2份之1)的值
谢谢

Answer 1

3@（4@2份之1)
=3@[(4-2*1/2)/(4*1/2)]
=3@(3/2)
=(3-2*3/2)/(3*3/2)
=(3-3)/(9/2)
=0

Answer 2

a@b=ab份之a-2b
3@（4@2份之1)
=3@（(4-4*1/2)/4*(1/2))
=3@(2/2)
=3@1
=3-2*1/3*1
=1/2