Question

Ex 11, dau coroana!!! Urgent!!

Answer 1

5•{5•[5•(5^2-3^2)-4^2]-15^2}:19-5^2=

5•{5•[5•(25-9)-4^2]-15^2}:19-5^2=

5•[5•(5•16-16)-225]:19-25

5•[5•(80-16)-225]:19-25

5•(5•64-225):19-25

5•(320-225):19-25

5•95:19-25

475:19-25

25-25=0