x+y分之一与x-y分之一通分,
问题描述:
x+y分之一与x-y分之一通分,
答
(X²-Y²)分之(X-Y)和(X²-Y²)分之(X+Y)
答
你好
1/(x+y)+1/(x-y)
=(x-y)/(x+y)(x-y)+(x+y)/(x-y)(x+y)
=[(x-y)+(x+y)]/(x+y)(x-y)
=2x/(x²-y²)
【数学辅导团】为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!
答
∵最简公分母为(x+y)(x-y)
∴x+y/1=(x+y)(x-y)/1×(x-y)=(x+y)(x-y)/x-y (记住不要化简)
∴x-y/1=(x+y)(x-y)/1×(x+y)=(x-y)(x+y)/x-y (“/”是分十一)
答
x×y啦,因为x×y的答案才是最准确的啦
答
1/(x+y)=(x-y)/(x²-y²
1/(x-y)=(x+y)/(x²-y²