<span>(√3) +4=√(8√3+19)
Возведем в квадрат
</span>
<span>((√3) +4)²=(√(8√3+19))²
(√3)²+2·(√3) ·4+4²=8·(√3)+19
3+8·(√3)+16=8·(√3)+19 - верно, значит</span>
<span><span>(√3) +4=√(8√3+19) - верно</span></span>
2.4х-8,4-2х+0,4=0,4х-8=0,4*4 1/6-8=2/5*25/6-8=5/3-8=-19/3=-6 1/3
√2*1/2sin45cos25/(sin80cos15-cos80sin15)=
=√2*1/2*1/√2cos25/sin(80-15)=1/2cos25/sin65=1/2cos25/cos25=1/2