八年级下数学x-1分之2+1-x分之x-1等于多少
问题描述:
八年级下数学x-1分之2+1-x分之x-1等于多少
答
x-1分之2+1-x分之x-1
=2/(x-1) + (x-1)/(1-x)
=2/(x-1)-(x-1)/(x-1)
=[2-(x-1)] / (x-1)
=(3-x)/(x-1)
当然,这里x肯定是不等于1的.