<span>S (АFB) = S (АВС) / 2 = 96 / 2 = 48 </span>
<span>S (DFB) = S (ADF) = S (AFB) / 2 = 48 / 2 = 24 </span>
<span>S (DEF) = S(DBF) / 2 = 24 / 2 = 12 </span>
<span>S (AEF) = S (ADF) + S (DEF) = 24 + 12 = 36</span>
(3/4 + 2 3/4) * 25,8 = 90,3
1) 3/4 + 2 3/4 = 2 6/4 = 3 2/4 = 3 1/2 = 3,5
2) 3,5 * 25,8 = 90,3
3/4 = 0,75 2 3/4 = 2,75 в десятичных дробях
(0,75 + 2,75) * 25,8 = 3,5 * 25,8 = 90,3
1)x=49
2)x=8
3)x=3
4)нет решения если там не -√2x+1=-7 или √2x+1=7