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√12 - √243 - √108 = √4*3 - √81*3 - √36*3 = 2√3 - 9√3 - 6√3 = -13√3
b)
√80 - √125 + √500 = √16*5 - √25*5 + √100*5 = 4√5 - 5√5 + 10√5 = 9√5
c)
√28- √175 + √252 = √4*7 - √25*7 + √36*7 = 2√7 - 5√7 + 6√7 = 3√7
d)
√243- √300 + √338 - +√48 = √81*3 - √100*3 + √169*2 + √16*3 =
= 9√3 - 10√3 + 13√2 + 4√3 = 3√3 + 13√2
e)
√800 + √80 - √200 + 500 =
= √400*2 + √16*5 - √100*2 + √100*5 = 20√2 + 4√5 - 10√2 + + 10√5 =
= 10√2 + 14√5