<span>log2 в степени 2 x+ log 0,5x=12
</span>log²_2 x-log_2 x-12=0
log_2 x=t
t²-t-12=0
D=1+48=49
t12=(1+-7)/2=4 -3
log_2 x=4
x=16
log_2 x=-3
x=2^-3=1/8
Sin 31 * cos 14 + sin 14 * cos 31 = sin (31+14) = sin 45 = √2 \ 2
Ab³+2a²b²+a³b=ab(b²+2ab+a²)=ab(b+a)²
5a-b+5a²-ab=(5a-b)+a(5a-b)=(5a-b)(1+a)