co bao nhieu so 8
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999899999999999999999999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999
có 4 số 8 nha mk xin lỗi mk nhìn nhầm
có 4 số 8