x²－64y²分之2x 减 x－8y分之1_数学解答

x²－64y²分之2x 减 x－8y分之1

人气：331 ℃　时间：2020-05-23 16:04:45

解答

2x/(x²－64y²) - 1/(x-8y) 根据公式：a²-b²=(a+b)(a-b)
=2x/(x+8y)(x-8y) - 1/(x-8y) 通分
=2x/(x+8y)(x-8y) - (x-8y)/(x+8y)(x-8y)
=(2x-x+8y)/(x+8y)(x-8y)
=(x+8y)/(x+8y)(x-8y)
=1/(x-8y)