а) 1) 7/8 * 4/1 - 7/8 * х = 7/2 - 7/8х;7/2 - 7/8х - 3/4 - х = (7/2 - 3/4) + (- х - 7/8х) = 11/4 - 1х - 7/8х= 11/4 - 1 7/8х = 2 3/4 - 1 7/8х. б) 1) - 1/2 * у - 1/2 * 2/19 = - 1/2у - 1/19;- 3/19 + у - 1/2у - 1/19 = ( - 3/19 - 1/19) + (1у - 1/2у) =- 4/19 + 1/2у.в) 1) - 7/13 * 26/27 - 7/13 * х = - 14/27 - 7/13х;- 14/27 - 7/13х - 4/9 + х = ( - 14/27 - 4/9) +( 1х - 7/13х) = -16/27 + 6/13х.г) 1) 3/4 * 1/8 + 3/4 * у = 3/32 + 3/4у- 1/16 + у + 3/32 + 3/4у = (3/32 - 2/32) + 1у + 3/4у = 1/32 + 1 3/4у.