计算: = .
am=2,an=3,则a2m﹣n= .
计算:a3•a= ,a3÷a= .
计算:(a2)3÷a4•a2= .
已知xm=10,xn=5,则x2m﹣n的值为 .
已知:162×43=4x+y,9x÷3y=9,则x= ,y= .