7 2 chia 2 4 x 4 5 July 8, 2019 16 32 64 128 Tìm x 7 2 chia 2 4 x = 4 5 (4 ^ 2 + 7 ^ 2) / 5 4 2-5 7= 4 2 + -2 7 = 4 2 + (-7 8)
