(-1)*2*(-3)*4*...(-49)*50*(-2)的50次方/2*4*6*...*100

问题描述:

(-1)*2*(-3)*4*...(-49)*50*(-2)的50次方/2*4*6*...*100

(-1)*2*(-3)*4*...(-49)*50*(-2)的50次方/2*4*6*...*100
=(-1)*2*(-3)*4*...(-49)*50*(-2)的50次方/(1)*2*(3)*4*...(49)*50*(-2)的50次方
=(-1)的25次方
=(-1)