我这是人教版的,不知道和你一样不
6.x²(x-1)-x(x²+x-1)
=x³-x²-x³-x²+1
=-2x²+1
将x=1/2代入得式子=1/2
7.(1).(x-3)(x-30-6(x²+x-1)
=x²-6x+9-6x²-6x+6
=-5x²-12x+15
(2).
我这是人教版的,不知道和你一样不
6.x²(x-1)-x(x²+x-1)
=x³-x²-x³-x²+1
=-2x²+1
将x=1/2代入得式子=1/2
7.(1).(x-3)(x-30-6(x²+x-1)
=x²-6x+9-6x²-6x+6
=-5x²-12x+15
(2).