数学高手来答~分式计算~y2-x2 x+y______________ ÷ ______________ 5x2-4xy 5x-4y

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数学高手来答~分式计算~y2-x2 x+y______________ ÷ ______________ 5x2-4xy 5x-4y
数学高手来答~分式计算~
y2-x2 x+y
______________ ÷ ______________
5x2-4xy 5x-4y

数学高手来答~分式计算~y2-x2 x+y______________ ÷ ______________ 5x2-4xy 5x-4y
.
为(y-x)/x
(把除的看成乘它的倒数,然后因式分解)

(y^2-x^2)/(x+y)
=(y-x)(y+x)/(x+y)
=y-x
(5x^2-4xy)/(5x-4y)
=x(5x-4y)/(5x-4y)
=x