(y/-6x^2)^2/(-y/2x^2)^3 化简求值 (1/2a-2b)【ab-(1/2a+2b)^2],其中a=2.b=-1 急
问题描述:
(y/-6x^2)^2/(-y/2x^2)^3 化简求值 (1/2a-2b)【ab-(1/2a+2b)^2],其中a=2.b=-1 急
答
(1)原式=(y^2/36x^4)*(8x^6/-y^3)
=-2x^2/9y
(2)原式=(1/2*2-2*(-1))(-2-(1/2*2-2)^2)
=(1+2)(-2-(1-2)^2)
=3 (-2-1)
=-9