from tkinter import *

def multi():
    a =float(r1.get())
    c =float(r2.get())
    d = a*c
    print(d)
    t4["text"] = d

janela = Tk()
janela.geometry("300x300+200+200")
a =0
c =0

t1 = Label(janela ,text = 'Os valores para conta de multiplicação são ?')
t1.place(x=1,y=1)

r1 = Entry(janela)
r1.place(x=1,y=30)

t2 = Label(janela, text = 'x')
t2.place(x=124,y=30)

r2 = Entry(janela)
r2.place(x=135,y=30)

bt2 = Button(janela, width=20,text = "Calcular!",command = multi)
bt2.place(x=1,y=90)

t3 = Label(janela, text = "O resultado é : ")
t3.place(x=1,y=55)

t4 = Label(janela, text = "?")
t4.place(x=80,y=55)



janela.mainloop()