2 5/6 - 5х = 1 1/3
2 5/6 - 1 1/3 = 5х
5х = 17/6 - 4/3
5х = (17 - 8)/6
5х = 9/6
х = 3/10
XXV<span>- 25
</span>LXXIV - 74
<span>XL - 40
</span><span>CDXIX - 419
</span><span>DCCLVI - 756
</span>1)XXV, 2)XL, 3)LXXIV, 4)CDXIX, 5)DCCLVI<span>
</span>
1) 2 3
2) 2 3
3) 2 3 4
4) 1 2 3 4
5) 4
6) 2
1225,1300.2000,525 они все кратны 5
((a+b)^2-5^2)/a-b+5=((a+b)-5)((a-b)+5)/a-b+5=a+b-5