先化简再求值x(-6x-9)-x(-8x-15)+2x(3-x)其中x=-1/6 -3a(1/3a^2b-2a)-2a^2(ab+3)其中a=1/3 ,b=-9还有两道-3/2X(1-x+4x^2-2x^4)(2/3ab^2-ab+3/4b)×(-1/2ab)

问题描述:

先化简再求值x(-6x-9)-x(-8x-15)+2x(3-x)其中x=-1/6 -3a(1/3a^2b-2a)-2a^2(ab+3)其中a=1/3 ,b=-9
还有两道-3/2X(1-x+4x^2-2x^4)
(2/3ab^2-ab+3/4b)×(-1/2ab)