Question

2x立方减3x加三分之二x立方减2x减3分之4x立方加x减1,其中x=负二分之一.先化

Answer 1

2x立方减3x加三分之二x立方减2x减3分之4x立方加x减1,其中x=负二分之一
=2x^3-3x+2/3x^3-2x-4/3x^3+x-1
=4/3x^3-4x-1
=4/3*(-1/2)^3-4*(-1/2)-1
=4/3*(-1/8) +2-1
=-1/6 +1
=5/6