通分；4x/5y²z与-3z/10x²y；x/x²+3x+2,-x/x²+2x+1与-1/3x+6 已知A÷x²-y²/x²+4xy+4y²=x+2y/x+y,当x=2,y=1时,求A的值通分；2/3a与3/-4ab²
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