因为|a-4|+√(b-9)=0,|a-4|≥0,√(b-9)≥0所以a-4=0且b-9=0a=4,b=9所以(a²+ab)/(b²)×(a²-ab)/(a²-b²)=[a(a+b)]/(b²)×[a(a-b)]/[(a+b)(a-b)]=(a²)/(b²)=(4²)/(9²...