К одной кнопке привязать несколько функций

from tkinter import *
 
window = Tk()
window.title("Калькулятор")
window.geometry('200x200')
global summ
def plus():
  x = int(t1.get())
  y = int(t2.get())
  summ = x + y
def minus():
    x = int(t1.get())
    y = int(t2.get())
    minus = x - y
def umn():
    x = int(t1.get())
    y = int(t2.get())
    umn = x * y
def dell():
    x = int(t1.get())
    y = int(t2.get())
    if y != 0:
        dell = x / y
    else:
        print("ошибка")
def ravno():
     t3.insert(0, summ)    
def ravno1():
     t3.insert(0, a)
def ravno2():
     t3.insert(0, umn)
def ravno3():
     t3.insert(0, dell)
 
l1 = Label(window, text="Введите Х:")
l1.grid(column=0, row=0)
t1 = Entry(window, width=10)
t1.grid(column=1, row=0)
 
l2 = Label(window, text="Введите Y:")
l2.grid(column=0, row=1)
t2 = Entry(window, width=10)
t2.grid(column=1, row=1)
 
b1 = Button(window, text="+", command = plus)
b1.place(x=5, y=55, width=40)
 
b2 = Button(window, text="-",command = minus)
b2.place(x=60, y=55, width=40)
 
b3 = Button(window, text="/",command = dell)
b3.place(x=110, y=55, width=40)
 
b4 = Button(window, text="*",command = umn)
b4.place(x=160, y=55, width=40)
 
b5 = Button(window, text="=", command = lambda:(ravno(), ravno1(), ravno2(), ravno3()))
b5.place(x=70, y=100, width=60)
 
l3 = Label(window, text="Результат:")
l3.place(x=5, y=153)
 
t3 = Entry(window, width=10)
t3.place(x=95, y=153)
 
window.mainloop()