分式运算速度4x²-y² (2x-y)² 2y²-4xy------- - --------- - ----------- 计算!x²-4y² x²-4y² 4y²-x²
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![分式运算速度4x²-y² (2x-y)² 2y²-4xy------- - --------- - ----------- 计算!x²-4y² x²-4y² 4y²-x²](/uploads/image/z/13574737-1-7.jpg?t=%E5%88%86%E5%BC%8F%E8%BF%90%E7%AE%97%E9%80%9F%E5%BA%A64x%26%23178%3B-y%26%23178%3B+%EF%BC%882x-y%EF%BC%89%26%23178%3B+2y%26%23178%3B-4xy-------+-+---------+-+-----------+%E8%AE%A1%E7%AE%97%21x%26%23178%3B-4y%26%23178%3B+x%26%23178%3B-4y%26%23178%3B+4y%26%23178%3B-x%26%23178%3B)
分式运算速度4x²-y² (2x-y)² 2y²-4xy------- - --------- - ----------- 计算!x²-4y² x²-4y² 4y²-x²
分式运算速度
4x²-y² (2x-y)² 2y²-4xy
------- - --------- - ----------- 计算!
x²-4y² x²-4y² 4y²-x²
分式运算速度4x²-y² (2x-y)² 2y²-4xy------- - --------- - ----------- 计算!x²-4y² x²-4y² 4y²-x²
4x²-y² (2x-y)² 2y²-4xy
------- - --------- - -----------
x²-4y² x²-4y² 4y²-x²
4x²-y² (2x-y)² 2y²-4xy
= ------- - --------- + -----------
x²-4y² x²-4y² x²-4y²
=( 4x²-y²-4x²+4xy-y²+2y²-4xy)/(x²-4y²)
=( -y²-y²+2y²)/(x²-4y²)
=0/(x²-4y²)
=0
=[(4x^2-y^2)-(4x^2-4xy+y^2)+(4xy-2y^2)]/(x^2-4y^2)
=(8xy-4y^2)/(x^2-4y^2)
因式分解后不能约分,所以做到这步就结束了。