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cuongxq8
2 năm trước
BÀI 1:cho biểu thức A=4/ √b -1+3/ √b +1-6 √b+2/b-1 a, rút gọn A với b ≥0,b khác 1 b,tính giá trị của biểu thức A khi b=6+2 √5 bài 2:rút gọn biểu thức B=(a-1/ √a-1-1/ √a+1). √a+1/ √a+2 với a ≥0,a khác 1 bài 3.cho biểu thức:P=(1/x- √x+1/ √x-1):( √x+1/x-2 √x+1) (vs x>0,x khác 1) a,rút gọn biểu thức P b,tính giá trị biểu thức P khi x=3-2 √2. giúp mik vs ạ đang cần gấp
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