67-х: 28=52
-х: 28=15
х=(-15)*28
<span>х=-420
ну както так
</span>
X = (1+16a)/(4a-1)
x =5
(1+16a)/(4a-1) = 5
1+16a = 5*(4a-1)
1+16a=20a-5
4a=6
a=3/2
А) 25 1/36 - 7 31/36= 17 6/36
17 6/36 - 8 17/36 = 8 25/36
X= 8 25/36
Б) 12 13/45 - 3 23/45= 8 36/45
8 36/45 + 5 17/45= 13 54/45 = 14 9/45
X= 14 9/45 или 13 54/45
1) 56+а+14=70+а
2)342+b+58=400+b
3)805+x+195=1000+x
4)m+4563+1837=6400+m