通分a/a+b和b/a-b
问题描述:
通分a/a+b和b/a-b
答
a/a+b=a(a-b)/(a+b)(a-b)=(a²-ab)/(a²-b²)
b/a-b=b(a+b)/(a-b)(a+b)=(ab+b²)/(a²-b²)
答
a/(a+b)=a(a-b)/(a-b)(a+b)
b/(a-b)=b(a+b)/(a-b)(a+b)