Question

Программа есть, только ошибка выводится , разобраться) from tkinter import *

def qq():

a = EntryA.get()

a = int(a)

result1 = str1+a+a*a)/(2*a+a*a)+2-((1-a+a*a)/(2*a-a+a*a)))*(5-2*a*a))

result2 = str((4-a*a)/2)

EntryC.delete(0, END)

EntryC.insert(0, result1)

EntryD.delete(0, END)

EntryD.insert(0, result2)

root = Tk()

root.title('уравнения')

root.geometry('800х800')

can1 = Canvas(root)

can1.grid(row=0, sticky=W)

img1=PhotoImage(file='aaa1.png')

can1.create_image(160,60,image=img1)

can2 = Canvas(root)

can2.grid(row=1, sticky=W)

img2=PhotoImage(file='aaa2.png')

can2.create_image(60,50,image=img2)

Label(root, text='Введите a').grid(row=1, sticky=E)

EntryA = Entry(root, width=10,font='Arial 16')

EntryC = Entry(root, width=20,font='Arial 16')

EntryD = Entry(root, width=20,font='Arial 16')

EntryA.grid(row=1, column=1, sticky=E)

EntryC = Entry(root, columnspan=1)

EntryD = Entry(root, columanspan=1)

but = Button(root, text='Решить', command=qq)

but.grid(row=2, sticky=W)

root.mainloop()