观察下面三行单项式:x,2x^2,4x^3,8x^4,16x^5,32x^6,…(1) - -2x观察下面三行单项式:x,2x^2,4x^3,8x^4,16x^5,32x^6,…(1) --2x,4x^2,-8x^3,16x^4,-32x^5,64x^6,…(2)2x^2,-3x^3,5x^4,-9x^5,17x^6,-33x^7…(3)取每行的第11个单项式,今这三个单式的和为A,计算当x=1/2时,512(A+1/4)的值

问题描述:

观察下面三行单项式:x,2x^2,4x^3,8x^4,16x^5,32x^6,…(1) - -2x
观察下面三行单项式:x,2x^2,4x^3,8x^4,16x^5,32x^6,…(1) -
-2x,4x^2,-8x^3,16x^4,-32x^5,64x^6,…(2)
2x^2,-3x^3,5x^4,-9x^5,17x^6,-33x^7…(3)取每行的第11个单项式,今这三个单式的和为A,计算当x=1/2时,512(A+1/4)的值