已知x+3y=10,求(x^2-9y^2)÷(x-3y)的值?

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已知x+3y=10,求(x^2-9y^2)÷(x-3y)的值?
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已知x+3y=10,求(x^2-9y^2)÷(x-3y)的值?
已知x+3y=10,求(x^2-9y^2)÷(x-3y)的值?

已知x+3y=10,求(x^2-9y^2)÷(x-3y)的值?
首先化简分式
=(x+3y)(x-3y)/(x-3y)
=x+3y
=10

10

(x^2-9y^2)÷(x-3y)
=X+3Y
=10

原式=(x+3y)(x-3y)÷(x-3y)
=x+3y
=10

(x^2-9y^2)÷(x-3y)
=(x-3y)(x+3y)÷(x-3y)
=x+3y
=10

x^2-9y^2=(x-3y)*(x+3y)
所以x-3y除掉了,剩下x+3y
结果是10

(x^2-9y^2)÷(x-3y
=(x-3y)(x+3y)÷(x-3y
=x+3y
=10

10