(x2+xy) / (x2-y2) = x(x+y) / (x-y)(x+y) = x/ (x-y) = 1 / (x/x -y/x) = 1 / (1 -y/x)
x=2,4,y=0,4
1 / (1 -0,4/2,4) = 1 / (1 -1/6) = 1 / (5/6) = 6/5 = 1,2
ответ 1,2
8x+3=1-(2x+4)
8x+3=1-2x-4
8x+2x=1-4-3
10x = -6
x = -0.6
Cos*cos45-sin15*cos45=0.5(COS30-cos60+cos60-COS90)=0.5(cos30-cos90)=КОРЕНЬ(3)/4
24+m-36+ m=(-12)+2m
Ответ:(-12)+2m