<span>1) 14/75 и 8/15 = 14/75 < 40/75</span>
<span>2) 9/16 и 4/9 = 81/144 > 64/144</span>
<span>3) 5/12 и 3/8 = 10/24 > 9/24</span>
<span>4) 7/32 и 13/24 = 21/96 < 52/96</span>
<span>5) 8/105 и 7/135 = 72/945 > 49/945</span>
<span>6) 13/25, 11/15 и 3/20 = 156/300, ? 220/300 и 45/300-вот тут я не поняла , что надо???</span>
<span>7) 5/2а и 8/3а = 15/6а < 16/6а</span>
<span><span>8) b/8сd и n/10d = 5b/40cd > 4cn/40cd</span></span>
15/18 (т.к. 7/9 = 14/18, а 8/9 = 16/18) и 22/27 (7/9 = 21/27, 8/9 = 24/27)
Х+28.2+х=156.8
х+х=156.8-28.2
2х=128.6
х=128.6:2
х=64.3
(21-7)+9=23
a=23-9
a=14
x=14+7
x=21