(2√0,5)² = 4*0,5=2
√1985²-1984² =√1985²-√1984²= 1985-1984=1
√75*0,27 = √20,25 = 4,5
√27 * √48 = √27*48 = √1296 = 36
<span>X* 100=380000+7000
Х*100=</span>387000
Х=387000:100
Х=3870
<span>х :100=380000+7000
</span>х:100=387000
х=387000*100
х=38700000
<span>Х *1000=380000+7000
</span>Х*1000=387000
Х=387000:1000
Х=387
477+a=519
a = 519 - 477
a = 42