305.
а) 4/15 = 8/30 ⇒⇒ 4/15 > 1/30,
б) 9/14 = 27/42, 14/21 = 28/42 ⇒⇒ 9/14 < 14/21,
306.
а) 7/12 = 28/48 ⇒⇒ 7/12 < 29/48,
б) 13/18 = 65/90, 11/15 = 66/90 ⇒⇒ 13/18 < 11/15
<span>(1,37-0,37)у=664*(39,7-29,7)
у=664*10
у=6640
</span><span>(100,83-0,83)у=583,7-83,7
</span>100у=500
у=500/100
у=5
5(4-7х)+1=34-9х
20-35х+1=34-9х
-35х+9х=34-20-1
-26х=13
х=13/-26
х=-0,5
1)65:9=7(ост.2) Проверка 1)2<9
2)7*9=63
3)63+2=65