rút gọn P=(√ x/3+√ x+2x/9-x ):(√ x-1/x-3√ x -2/√ x)A=(√ x-2/√ x+5+√ x/√ x-5 +x+9/25-x):1-√ x/5+√ x B=(1/x-4 - 1/x-4√ x+4):√ x/2√ x -x
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