100÷(x+y)十64÷(x-y)=9,80÷(x+y)+80÷(x-y)=9,求x,
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100÷(x+y)十64÷(x-y)=9,80÷(x+y)+80÷(x-y)=9,求x,
100÷(x+y)十64÷(x-y)=9,80÷(x+y)+80÷(x-y)=9,求x,
100÷(x+y)十64÷(x-y)=9,80÷(x+y)+80÷(x-y)=9,求x,
100÷(x+y)十64÷(x-y)=9,80÷(x+y)+80÷(x-y)=9,求x,
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