化简a²-b²/a²+ab
问题描述:
化简a²-b²/a²+ab
答
=[(a+b)(a-b)]/[a(a+b)]
=(a-b)/(a)
这个是正解
答
40/2=20 20*20*3.14*60*0.85=~
答
=[(a+b)(a-b)]/[a(a+b)]
=(a-b)/(a)