5/8х - 2 3/4 = 3/8
5/8х = 2 3/4 + 3/8
2 3/4 + 3/8 = 2 6/8 + 3/8 = 2 9/8 = 3 1/8 = 25/8
5/8х = 25/8
5х = 25
Х = 25 : 5
Х = 5
1)AB=8 AE=EB=BF=8:2=4
S=AB*BF=8*4=32
2) S= (FJ*AB):2 * BF= (4*8)/2 *4 = 64
3) S=1/2*AE*EJ=1/2 * 4 * 4 = 8
№1
а) 32/76=8/19
б) 362/436=181/218
в) 350/1925=2/11
№2