Đáp án:
m)(x²-5)/(x+√5) n)(x²+2.√2x+2)/(x²-2) p) 36÷√(2.3².18)-√168 q)√(3²+4²)
= (x²-√5²)/(x+√5) = (x+√2)²/(x+√2).(x-√2) =36÷√324 -√168 = √9+16
= (x+√5).(x-√5)÷(x+√5) =(x+√2)/(x-√2) = 36/18 -2√42 =√25
=x-√5 = 2-2√42 =5
a)√16 .√25 +√(196÷√49) b)5.√((-2)∧4)
=4.5+√(196/7) = 5.√16
=20+√28 =5.4
=20+2√7 =20