9*8-(3√8*√37)+(√37* 3√8) -37=72-37=35
12а-30b+28b+7a=19a-2b
19×1-2(-2.4)=19+4.8=23.8
<span>х^2=(х-6)^2+(х-3)^2</span>
x²=x²-12x+36+x²-6x+9
<span>x</span>²-18x+45=0
<span>D=324-4*45=144=12</span>²
<span>x1=(18+12)/2=15
x2=(18-12)/2=3
</span>
Разность равна d = (an - ak)/(n - k) = (70 - (-5))/(32-7) = 75/25 =3
a7 = a1 + (n-1)d
-5 = a1 + (7-1)3
a1 = -23
a32 = a1<span> + (32-1)d
</span>70 = a1 + 31 * 3
a1 = -93 + 70 = -23
1. приведем к общему знаменателю левую часть и перевернем правую