(1000-289)*8=5688
или
1) 1000-289=711
2) 711*8=5688
3 1/3*4 2/3=
10 1/3:5 1/5=
4 5/10-2 2/10=
3 3/9*3 4/9=
10 5/10:3 5/10=
3 1/2*7 3/2=
4 4/5-2 3/5=
14 1/7:2 1/7=
<span>(7/12 - 8/15)² + 4/5 * (7/10 - 9/16) = 9/80 (или 0,1125),,
1) 7/12 - 8/15 = 35/60 - 32/60 = 3/60 = 1/20,
2) (1/20)</span>² = 1/400 (или 0,0025),
3) 7/10 - 9/16 = 56/80 - 45/80 = 11/80,
4) 4/5 * 11/80 = 11/100 (или 0,11),
5) 1/400 + 11/100 = 1/400 + 44/400 = 45/400 = 9/80
(или 5) 0,0025 + 0,11 = 0,1125)