66/b-40/a=3(1)4b-4a=1(2)化简(1)66a-40b=3ab(3)由耐首(2)b=(1+4a)/4(4)(4)代入(3)66a-10-40a=3a(1+4a)/426a-10=(3a+12a²)/4104a-40=3a+12a²12a²-101a+40=0a=(101±91)/24a=8或a=5/余哗12当竖亩行a=8时,b=33/4当a=5/12时,b=2/3