Номер 1
а) (а²-2a+6)-(a-2a²)=a²-2a+6-a+2a²=3a²-3a+6
б) 2a²b(a+3b)-3a²b(a-2b)=2a³b+6a²b²-3a³b+6a²b²=12a²b²-a³b
Номер 2
а) M+(2xy+x²)=2x²+xy-2y²
M=2x²+xy-2y²-2xy-x²=x²-xy-2y²
б) M-(x²-2xy+3y²)=x²+xy-y²
M=x²+xy-y²+x²-2xy+3y²=2x²-xy+2y²
Log(1/8) 16 : log(3) 27 * 4^(log4 2) = log (2^-3) 2^4 : log(3) 3^3 * 2 = -4/3 : 3 * 2= = -8/9
a^log(a) b=b
log (a^n) a^m = m/n
0.4а+3-0.5а+6=-0.1а+9=-0.1×90+9=0
3а+7b-4a-3b=-a+4b=-0.2-0.8=1
<span>cos 3x = √3 / 2
</span>cos 3x = cos п/ 6
3x = -/ + п/ 6 + 2пk , k Є Z
x = -/ + п/ 18 + 2пk/3 , k Є Z