(0,561-0,539):(0,561+0,539)= 0,022:1,1=0,02
( 19/7 - 7/7 ) - (-7/3 - 18/4) = 12/7 + 41/6 = 359/42
При x=3
0,22*3+0,34*3-0,16*3=1,2
При x=20
0,22*20+0,34*20-0,16*20=8
3 3/4 * 2/5 - 3 6/25 * 5/27=9/10
1) 3 3/4 * 2/5 = 15/4 * 2/5 = (15*2)/(4*5)=3/2
2) 3 6/25 * 5/27 = 81/25 * 5/27 = (81*5)/(25*27)=3/5
3) 3/2-3/5=15/10-6/10=9/10