已知a/1+b/1=3,求2a-3ab+2b/3a+2ab+3b的值
问题描述:
已知a/1+b/1=3,求2a-3ab+2b/3a+2ab+3b的值
2a-3ab+2b/3a+2ab+3b怎么化简?
答
因为a/1+b/1=3 两边同乘ab得a+b=3ab
(2a-3ab+2b)/(3a+2ab+3b)=(2a+2b-3ab)/(3a+3b+2ab)=(6ab-3ab)/(9ab+2ab)=3/11