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√(8-2√15)+√(7-4√3)+√(14-6√5) =(√5-√3)+(2-√3)+(3-√5) =5-2√3
7-4+15*6 =3+90 =93
x分之0.15等於40分之5 0.15/x=1/8 x=0.15*8 x=1.2
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