Question

Выполните устно вычисления используя свойства умножения. 25*17*4= 45*6*2= 25*21*4*2= 15*4*10=

Answer 1

25*17*4=25*4*17=100*17=1700
45*6*2=45*2*6=90*6=540
25*21*4*2=25*4*2*21=100*2*21=200*21=4200
15*4*10=(10*4+5*4)*10=(40+20)*101=60*10=600

Answer 2

1. 1700
2. 540
3. 4200
4. 600

Answer 3

25*17*4 = (25*4)*17 = 100*17 = 1700 45*6*2 = (45*2)*6 = 90*6 = 540 25*21*4*2 = (25*4)*21*2 = 100*21*2 = 4200 15*4*10 = (15*10)*4 = 150*4 = 600

Итак, 25*17*4 = 1700, 45*6*2 = 540, 25*21*4*2 = 4200, 15*4*10 = 600.