1) x_>-8
2) x+3_>-5
1) x =1 ,2...8
2)x=1...5
<span>(2 5/9-1 20/21):1 8/49+1 8/9:6= 855/1026
1)2 5/9-1 20/21=2 35/63 - 1 60/63=1 98/63-1 60/63=38/63
2)</span><span>1 8/9:6= 17/9·1/6=17/54
</span>3)38/63:1 8/49=38/63:57/49=<span><span><span>38/63·49/57=266/513
</span>4)266/513+17/54=532</span>/1026+323/1026=855/1026
(1 17/18*1 13/14-2 5/8:1 19/20):(2 25/78-1 1/26)=</span><span><span>1 91/104</span>
1)1 17/18*1 13/14=35/18·27/14=15/4
2)2 5/8:1 19/20=21/8·20/39=35/26
3)15/4-35/26=195/52-70/52=125/52
4)</span><span>2 25/78-1 1/26=1 25/78-3/78=1 22/78=1 11/39
5)125/52:50/39=</span><span>125/52·39/50=195/104=1 91/104</span>
<span>х+3,12=-5,43</span>
<span>х=-5,43-3,12</span>
х=-8,55
х=-8,55:1
х=-8,55
Ответ:-8,55
Проверка:
-8,55+3,12=-5,43
-5,43=-5,43
6,4 % = 0,064
Или
64/1000 = 16/25
Ответ 0,064 ( или 16/25 )