Rút gọn các biểu thức:
a) \(A=2\sqrt{20}+3\sqrt{45}-4\sqrt{80}.\)
b) \(B=\left( 2+\frac{1}{\sqrt{x}-1} \right).\frac{x-1}{2\sqrt{x}-1}\,\,\,\left( x\ge 0;x\ne 1;x\ne \frac{1}{4} \right).\)
A.a) \(A=-7\sqrt{5}\)
b) \(B=\sqrt{x}+1\)
B.a) \(A=-3\sqrt{5}\)
b) \(B=\sqrt{x}+1\)
C.a) \(A=-3\sqrt{5}\)
b) \(B=\sqrt{x}-1\)
D.a) \(A=13\sqrt{5}\)
b) \(B=\sqrt{x}-1\)
a) \(A=2\sqrt{20}+3\sqrt{45}-4\sqrt{80}.\)
b) \(B=\left( 2+\frac{1}{\sqrt{x}-1} \right).\frac{x-1}{2\sqrt{x}-1}\,\,\,\left( x\ge 0;x\ne 1;x\ne \frac{1}{4} \right).\)
A.a) \(A=-7\sqrt{5}\)
b) \(B=\sqrt{x}+1\)
B.a) \(A=-3\sqrt{5}\)
b) \(B=\sqrt{x}+1\)
C.a) \(A=-3\sqrt{5}\)
b) \(B=\sqrt{x}-1\)
D.a) \(A=13\sqrt{5}\)
b) \(B=\sqrt{x}-1\)
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