已知2x-3=0,那么:2x=3,解得:a=2分之3
所以:
x(x²-x)+x²(5-x)
=x²(x-1)+x²(5-x)
=x²(x-1+5-x)
=4x²
=4*(2分之3)²
=4*(4分之9)
=9