ab≠0 且1/a+1/b=4 求4a+3ab+4b/3a-2ab+3b的值

ab≠0 且1/a+1/b=4 求4a+3ab+4b/3a-2ab+3b的值
ab≠0 且1/a+1/b=4 求4a+3ab+4b/3a-2ab+3b的值

ab≠0 且1/a+1/b=4 求4a+3ab+4b/3a-2ab+3b的值
分子分母同除以 ab
（4a+3ab+4b）/（3a-2ab+3b）
= (4/b+4/a+3)/(3/b+3/a-2)
= (4*4+3)/(3*4-2)
= 19/10