a)=2√5-√5·9+√16·5=2√5-3√5+4√5=3√5.
б)=5√x+2√x - 6√x=√x.
в)=(√16·3 -√3)·√3=4·(√3)²-(√3)²= 12-3=9,
г)=(√а)²-(√в)²-а=а-b-а= -b.
д)=(√x)²-2√x·√y+(√y)²+2√xy=x -2√xy+y+2√xy=x+y.
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a)=2√5-√5·9+√16·5=2√5-3√5+4√5=3√5.
б)=5√x+2√x - 6√x=√x.
в)=(√16·3 -√3)·√3=4·(√3)²-(√3)²= 12-3=9,
г)=(√а)²-(√в)²-а=а-b-а= -b.
д)=(√x)²-2√x·√y+(√y)²+2√xy=x -2√xy+y+2√xy=x+y.