Пошаговое объяснение:
1) 3 4/5- 2 3/5=( 3-1)+(4/5-3/5)=1 1/5
2)7 5/6 - 4 2/3= 7 5/6 - 4 (2*2)/6=7 5/6 - 4 4/6= 3 1/6
3) 4 5/6 - 2 5/12 = 4 (5*2)/12- 2 5/12= 4 10/12- 2 5/12=2 5/12
4) 10 4/9 - 8 5/18 = 10 ( 2*4)/18 - 8 5/18= 10 8/18 - 8 5/18=2 3/18
=2 1/6
5) 9 1/2 - 2 1/4= 9 (1*2)/4 - 2 1/4 = 9 2/4- 2 1/4= 7 1/4
6) 6 3/4 - 2 2/3= 6 (3*3)/12 - 2 (2*4)/12= 6 9/12- 2 8/12= 4 1/12
7) 11 3/7 - 5 1/3 = 11 (3*3)/21 - 5 (1*7)/21= 11 9/21 - 5 7/21= 6 2/21
8) 8 3/8 - 6 3/10 = 8 (3*5)/40 - 6 (3*4)/40=8 15/40 - 6 12/40 = 2 3/40
х^2+х^2=16
2х^2=16
х^2=8
х=2корень из 2