√45 + √¹⁶/₉ - √(9-4) - √20 =

√45 + √¹⁶/₉ - √(9-4) - √20 = 3√5+4/3-√5-2√5=4/3

√45+√¹⁶/₉-√(9-4)-√20=3√5+⁴/₃-√5-2√5=⁴/₃=1⅓

√45 + √¹⁶/₉ - √(9-4) - √20 = √9*5+ √15/9- √5- √4*5= 3 √5+ 4/3- √5-2 √5= 4/3