5x 7 8 x 4 July 8, 2019 16 32 64 128 9 6 7 5x )= 8 2 x 4 7 5x 8 12 x 4 5x 7 8x 49 5x 7 8x 4 180 C 5x 7 8 x biết x 4 40 =- 5x 7 x 8 3 4 * x 5x 7 8 7x 6 5x − 7 x 4 )= 2x 8 X x 8 )- 4 5x 7 )= 0 4 5x 8 5 (- 7 4.1 x
