Tìm x, biết: [1/2 + 1/4 + 1/8 + 1/16 ] : x = 1/2 + 1/6 + 1/12 + 1/20 +.......+ 1/132

tìm x
A. [1/2 + 1/4 + 1/8 + 1/16 ] : X = 1/2+1/6 +1/12 +1/20 +.......+1/132
B .[x+1/2] + [x+1/4] +[x+1/8] + [x+1/16] = 1