Question

计算：（3）a²-9分之a-4÷a-3分之1*a²-16分之a²-6a+9

Answer 1

麻烦问题表述的时候最好加上括号.你想求的是这样：[(a-4)/(a²-9)] ÷ [1/(a-3)] × [(a²-6a+9)/(a²-16)] ,还是这样：[(a-4)/(a²-9)] ÷ {[1/(a-3)] × [(a²-6a+9)/(a²-16)]} ,或者是...