计算题 (x+1-(1-x)分之1)÷(x-(x-1分之x²)(1-x)分之1单独看,代表1________分数线1-x亲们看得懂?
问题描述:
计算题 (x+1-(1-x)分之1)÷(x-(x-1分之x²)
(1-x)分之1单独看,代表
1
________分数线
1-x
亲们看得懂?
答
(x+1- __1_)÷(x- x² )
1-x x-1
=(x+1+ _1___)÷(x- x² )
x-1 x-1
=(x²-1+ 1__)÷(x² -x - x² )
x-1 x-1 x-1 x-1
=( x²-1+1)÷(x² -x - x² )
x-1 x-1
=( x² )÷( -x )
x-1 x-1
=( x² )×( x-1 )
x-1 -x
=-x