X^2-x-6=0
D=1-4×(-6)=25
x1=(1-5)/2=-4/2=-2
x2=(1+5)/2=3
1 \5 2 \3 1*5 - 2*3 5-6
7 ------- - 6 ------ = (7-6)+( --------------------) = 1 + ---------------- =
6 10 30 30
= 1+ (-1/30) = 30/30 - 1/30 = -29/30
4 \2 8 \3 4*2 - 8*3 8 - 24
9 ---------- - 1 ------------- = (9-1)+(------------------) = 8 + ----------------- =
15 10 30 30
= 8 + 16/30 = 8 16/30 = 8 8/15
(1/8 + 2/9 - 1/4) * 5 1/7 : (7/9 - 2/3 + 1/6) = 1 4/5
1) 1/8 + 2/9 = (9+16)/72 = 25/72
2) 25/72 - 1/4 = (25-18)/72 = 7/72
3) 7/9 - 2/3 = (7-6)/9 = 1/9
4) 1/9 + 1/6 = (2+3)/18 = 5/18
5) 7/72 * 5 1/7 = 7/72 * 36/7 = 1/2
6) 1/2 : 5/18 = 1/2 * 18/5 = 9/5 = 1 4/5
7;-1,3;-1/5;5/4 вроде так