А -B = (√12 - √11) - (√13 - √12) = 2√12 - (√13 +√11) =
= 2√12 - √[24+2√11·13)] = 2√12 - √[24+2·√(12-1)(12+1)]=
= 2√12 - √[24 +2·√(12²-1)] = 2√12 - √[24 + 2·(12 -α)] =
α>0
=2√12 - √[4·(12 -α/2)] = 2√12 - 2√(12 - α/2) =
=2√12 - 2(√12 - β) = 2β >0
A > B
<span> 2/3 * 9/10 + 4/5 : 2/15= 6 целых 3/5 </span>
<span> 2/3*9/10=3/5</span>
<span>4/5 : 2/15 = 6</span>
<span>3/5 + 6 = 6 целых 3/5 </span>
-1 7/12 + 4/3= 19/12+16/12=35/12