请补全下列代码， 编程实现用递归的方法输出九九乘法表。

def get_result(num):

    if num == 1:

        print(" ____①____ ")

    else:

        get_result( ____②____ )

        for i in range(1, ____③____ ):

            print("%d * %d = %d" % (i, num, i * num), end=" ")

        print()

get_result( ____④____ )