1.写代码获取数字1234中的十位上和百位上的数字

number10 = (1234//10)%10  #通过运算求得1234的10位上的数字
print(number10)  #十位数字为3
number100 = (1234//100)%10  #求1234百位上的数字
print(number100)   #百位数字为2

2.如果变量n的值是6784, 以下表达式的结果是多少？

n / 1000 % 100
n % 1000 / 100
n // 100 % 10
n // 10 % 100 // 10

n = 6784
number1 = n/1000%100
number2 = n%1000/100
number3 = n//100%10
number4 = n//10%100//10
print(number1)  # 输出number1 =6.784
print(number2)  # 输出number2 =7.84
print(number3)  # 输出number3 =7
print(number4)  # 输出number4 =7

3.表达式 10 / 4 + 23 // 4 * 2 - 30 的结果是多少?

print(10/4+23//4*2-30)  #输出-17.5

4.写出下面每一行中n3的结果：

n1 = 4; n2 = 5
n3 = n1 >n2
n3 = n1<n2
n3 = n1==4
n3 = n1!=4
n3 = n1 == 1+3

n1 = 4; n2 = 5
n3 = n1 > n2 
print(n3)  # 输出n3=False
n3 = n1 < n2
print(n3)  # 输出n3=True
n3 = n1 == 4
print(n3)  # 输出n3=True
n3 = n1 != 4
print(n3)  # 输出n3=False

5.写出以下代码执行完成后，num的结果

num = 10
num /= 2
num += 10 * 10 / 4 + 23*2

num = 10
print(num)   # 输出num=10
num /= 2
print(num)   # 输出num=5
num += 10*10/4+2*3**2
print(num)   # 输出num=48

6.下面定义变量正确的是()

a. a = b = c = 10
b. a, c = 10
c. in = 20
d. num = 10; t = 20

a = b = c = 10
# a,c = 10
# in = 20
num = 10;t = 20

定义正确的是a和d