Ответ:

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при х = -28:

54 - √х² = 54 - √(-28)² = 54 - 28 = 26,

√(25*400) + √(25/100) + √(-16)² =

= √(5²*20²) + √(5²/10²) + √(-16)² =

= 5*20 + 5/10 + 16 =

= 100 + 0,5 + 16 = 116,5,

√300/√3 - √32*√2 + √(5²*2⁴) =

= √(300/3) - √(32*2) + √(5²*4²) =

= √100 - √64 + √(5*4)² =

= √10² - √8² + √20² =

= 10 - 8 + 20 = 22