А) 1/2 и 6/5
5/10 и 12/10
5/10 < 12/10
значит, 1/2<6/5
б) 6/7 и 7/6
36/42 и 49/42
36/42 < 49/42
значит, 6/7<7/6
в) 2/5 и 5/2
4/10 и 25/10
2/5<5/2
г) 3/5 и 7/3
9/15 и 35/15
3/5<7/3
д) 17/13 и 7/8
17/13 > 1
7/8 < 1
значит, 17/13>7/8
е) 8/7 и 8/9
8/7 > 1
8/9 < 1
значит, 8/7 > 8/9
ж) 78/77 и 77/78
78/77 > 1
77/78 < 1
значит, 78/77 > 77/78
з) 89/90 и 90/89
89/90 < 1
90/89 > 1
значит, 89/90 < 90/89
137285:5=27457
37740:5:4=37740:5=7548:4=1862
<span><span><span><span><span><span><span><span><span><span><span><span><span><span><span /></span></span></span></span></span></span></span></span></span></span></span><span /></span></span><span /></span>
6.4x=0.16*2
6.4x=0.32
X=0.32/6.4
<span>X=0.05</span>
<span>560 : (43 + z)= 8
43 + z = 560:8
43 + z = 70
z = 70 - 43
z = 27
</span>
<span>560 : (43 + 27)= 8</span>
<span><span>560 : 70 = 8</span>
8 = 8
</span>