import numpy as np
import matplotlib.pyplot as plt
x=np.arange(-1,2,0.01)
y=x**5+x**4+x-3
plt.plot(x,y)
plt.title('x^5+x^4+x-3')
plt.xlabel('X')
plt.ylabel('Y')
plt.show( )
下列选择错误的是( )
a=1
if a<0:
print("a<0")
print("a<0")
elif a<1:
print("0<a<1")
else:
print("a>=1")
a=35
b=94
for x in:
if 2*x+4*y==b:
print("鸡有"+str(x)+"只","兔有"+str(y)+"只")
n=input(“请输入一个实数:”)
n2= math. floor(float(n))
print(n2)
score=int(input("请输入一个分数"))
if 100>=score>=90:
print("A")
if 90>score>=80:
print("B")
if 80>score>=60:
print("C")
if 60>score>=0:
print("D")
if score<0 or score >100:
print("输入错误!")