Пошаговое объяснение:
1. 5 2/9 x=1
47/9 x=1
x=9/47
2. 8 1/2:x+5 1/4=7 2/3
8 1/2:x =7 2/3-5 1/4= 2 5/12
8 1/2:x = 2 5/12
x= 2 5/12 : 8 1/2 =29/12 : 17/2=29/12× 2/17=29/102
x=29/102
3. (X-1/7)×4 2/3=1 2/7
X-1/7 = 1 2/7 : 4 2/3 = 9/7 : 14/3
X - 1/7 = 9/7 · 3/14 = 27/98
X= 27/98 + 1/7 = 41/98
X=41/98
4. (X+2 1/7 ): 4 2/3 =1 2/7
X+2 1/7=1 2/7×4 2/3= 9/7 × 14/3
X+2 1/7=6
X= 6-2 1/7= 3 6/7
X= 3 6/7
5, (2 1/2 - 5 1/2) : 5 2/9 = 2 1/4 тут непонятно чего надо?
6. (5 2/7-1/7+2 1/3)×2/7=5 1/7
(125+75)*8= 125 *8 +75*8 = 1000 + 600 = 1600