0 8 x 2 5 x 1 25 July 8, 2019 16 32 64 128 Tính nhanh 0 8 x 2 5 x 1 25 4 x 0 8 x 2 5 x 1 25 2 8 x 1 25 12 5 x 0 72 X 0 25 x chia 2 5 1 8 1) 0 8(0 5 + 2x) =2x+0 4 2) 0 2(x - 3) - 1 =0 5(x+3)-0 4 0 25 / x = 0 5 / 8 4
