for，while循环嵌套二次练习

for i in range(5):
    print(i)

#99乘法表
i=1
while i<=9:
    j=1
    while j<=i:
        print("%a*%a=%a"%(j,i,j*i),"\t",end="")
        j+=1
    print()
    i+=1

for i in range(1,10):
    for j in range(1,i+1):
        print("%a*%a=%a" % (j, i, j * i), "\t", end="")
    print()

for i in range(2,10):
    for a in range (1,i+1):
        for b in range(1,a+1):
            print(i,"+",a,"+",b,"/",end="")
        print()