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#1.写函数，给定符号和行数，如‘*’，5，可打印相应行数的如下图形
def graph():
    line='*****'
    num=5
    
    for i in range(1, len(line)+1):
        print((len(line)-i)*' ' + line[0]*i,end='')
        print()

graph()


    

    




    *
   **
  ***
 ****
*****

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#2.打印如下9*9乘法口诀表，注意每列左侧竖向对齐
for i in range(1,10):
    for j in range(1,10):
        if i >=j:
            print(i,'x',j,'=',i*j)
for i in range(1,10):
    print(i,'x',j,'=',i*j)


    

    




1 x 1 = 1
2 x 1 = 2
2 x 2 = 4
3 x 1 = 3
3 x 2 = 6
3 x 3 = 9
4 x 1 = 4
4 x 2 = 8
4 x 3 = 12
4 x 4 = 16
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
5 x 4 = 20
5 x 5 = 25
6 x 1 = 6
6 x 2 = 12
6 x 3 = 18
6 x 4 = 24
6 x 5 = 30
6 x 6 = 36
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
8 x 1 = 8
8 x 2 = 16
8 x 3 = 24
8 x 4 = 32
8 x 5 = 40
8 x 6 = 48
8 x 7 = 56
8 x 8 = 64
9 x 1 = 9
9 x 2 = 18
9 x 3 = 27
9 x 4 = 36
9 x 5 = 45
9 x 6 = 54
9 x 7 = 63
9 x 8 = 72
9 x 9 = 81

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#3.检查一个数（2-100000之间整数）能不能表示成两个质数之和，如果能，则打印这两个质数
if


    

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