√4*√7- 2√2a 2√7-2√2a 2(√7-√2a) =____________=_______________= __________________=
5((√2a)²-(√7)²) 5(√2a-√7)(√2a+√7) <span> 5(√2a+√7) ( √2a-√7)</span>
<span> 2</span>
<span>=_________</span>
<span>-5(√2a+√7
</span>
4х-5х<span>≥0,5+3-5
</span>-х≥-1,5
х≥1,5