A^2-5ab-6b^2=0,b≠0,求2a-b/3a+b
问题描述:
A^2-5ab-6b^2=0,b≠0,求2a-b/3a+b
答
a^2-5ab-6b^2=0(a+b)(a-6b)=0得 a=-b 或 a=6b当a=-b:2a-b=-3b;3a+b=-2b所以:(2a-b)/(3a+b)=-3b/-2b=3/2;当a=6b2a-b=11b;3a+b=19b所以:(2a-b)/(3a+b)=11b/19b=11/19; 所以最后答案为:3/2或11/19