5 2x 1 )= 6x 9 July 8, 2019 16 32 64 128 2x 1 3 6x 9 5 2x 1 )( 15 9x )- 6x 3x 5 )= 87 Solve 5 2x 1 )= 6x 9 2x 1 6x 5 90 6x 5 2x 1 9x 3x 1 0 5 6x 21 =- 1 3 2x 9 不等式 2x 1 4x 9 6x 5 2x 5
