Verified answer

а)1ц 1/5 * 1ц 2/3 * 1/7 + (1ц 1/7) ² = 6/5 * 5/3 * 1/7 + (8/7) ² = 2/7 + 64/49 = 14 / 49 + 64/49 =78\49= 1 ц 29/49

б)(2ц 1/6 - 2/3) ² - 2ц 1/5 = ( 13/6 - 4/6) ² -11/5 = (3/2) ² - 11/5 =9/4 - 11/5 =45/20-44/20=1/20

с)10 - 2 * (3ц 1/5 - 2ц 1/4 * 1/3) = 10 - 2 * (16/5 - 9/4 * 1/3) = 10 - 2 * (16/5 - 3 / 4) =

= 10 - 32/5+6/4 =200/20 - 128/20+30\20 =102/20=51/10= 5,1

д)(7/3 - 5/12 + 1ц 1/2): (2ц 3/4 - 5/6) = (7\3 - 5/12 + 3/2): (11\4 - 5/6) =(28\12-5\12+18/12) :(33/12-10/12)=41/12*12/23=41/23 = 1ц 18/23