4 7 x 5 6 3 7 x 5 6 July 8, 2019 16 32 64 128 3 4 x 4 5 5 6 x 6 7 x 7 8 5 6 x 1 3 + 7 6 x 5 1 7 = 4 8 9 Tính nhanh 4 7 x 5 6 3 7 x 5 6 5 x 7 = 35 4 5/7 x (-6 5/7) 4 5/7 - (x - 6 3/7) = 2 6/7 4 5/7 - x - 6 3/7 равно 2 6
