48-[(3a+2b)*(2+1)-(a-2b+2)]
=48-(9a+6b-a+2b-2)
=48-9a-6b+a-2b+2
=48+2-9a+a-6b-2b
=50-8(a+b)
=50-8a-8b
当a=11,b=112时,
原式=(11112-11211)/9=-11
所以可以整除.
48-[(3a+2b)*(2+1)-(a-2b+2)]
=48-(9a+6b-a+2b-2)
=48-9a-6b+a-2b+2
=48+2-9a+a-6b-2b
=50-8(a+b)
=50-8a-8b
当a=11,b=112时,
原式=(11112-11211)/9=-11
所以可以整除.