=75/100*34/3 - 89/10 * 11/89 = 3/4*34/3 - 11/10 = 34/4 - 11/10 = 8,5-1,1 = 7,4
=91/6 * 10/182 + 13/100*92/13 = 10/6 + 92/100 = 5/3 + 23/25 = 125/75 + 69/75 = 194 / 75 = 2ц44/75
=978/10 * 23/489 - 1/47 * 94/3 = 46/10 - 1/3 = 23/5-1/3=69/15-5/15=64/15=4ц4/15