Question

1×2÷3×4÷5×6÷7×8÷9×10÷11×12

Answer 1

原式=1*（2/3）*(4/5)*(6/7)*(8/9)*(10/11)*12

=(2*4*6*8*10*12)/(3*5*7*9*11)

=2*4*8*(6/3)*(10/5)*(12/9)*11/7

=64*2*2*(4/3)*11/7

=1024*11/(3*7)

=11264/21

=536.3809