计算:(3x^-1+3y^-1)÷(x^-2-y^-2)
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计算:(3x^-1+3y^-1)÷(x^-2-y^-2)计算:(3x^-1+3y^-1)÷(x^-2-y^-2)计算:(3x^-1+3y^-1)÷(x^-2-y^-2)原式=3(x^-1+y^-1)/
计算:(3x^-1+3y^-1)÷(x^-2-y^-2)
计算:(3x^-1+3y^-1)÷(x^-2-y^-2)
计算:(3x^-1+3y^-1)÷(x^-2-y^-2)
原式=3(x^-1+y^-1)/[(x^-1+y^-1)(x^-1-y^-1)]
=3/(x^-1-y^-1)
您好:
(3x^-1+3y^-1)÷(x^-2-y^-2)
=(3/x+3/y)÷(1/x²-1/y²)
=3(1/x+1/y)÷[(1/x+1/y)(1/x-1/y)]
=3/(1/x-1/y)
=3xy/(y-x)
不明白,可以追问
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