20 1 5 3 4 July 8, 2019 16 32 64 128 3 4 х 1 20 1 5 20( 1/5 u 3/4 ) 3 1 5 4x 20 1 5 (- 15w 20 )+ 1 2 3 4w 3sqrt 5 sqrt 20 1 3 * sqrt 45 3 4w 1 )- 5 =- 20 5 * 1 x * y * 3 4 20 5 1 3 4 3 x 9 20
