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thangskymtp96
2 năm trước
a √(1+x ²)=x-2 b √(x ²+4x+4)=x-2 c √(2x ²+7)=2-x d √(x ²+4x+3)=x-2 e √(x ²+4)+2-x=0 f √(x ²-4x+4)=2x-1 h √(2x ²+4x-1)=x-2 i √(2x-1)= √(x-1)
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