Выполни  вычисления удобным способом,применяя свойства сложения и умножения.

2х7х50х9=

6 200+1 730+800+170=

25х72х4х40=

1 645+2 316+1355+684=

1) 6300

2) 8900

3) 288000

4) 6000

1. 2х7 = 14 х 50 = 700 х 9 = 6 300

2.    6200            3. 25 х 72 = 1800 х 4 = 7200 х 40 = 288 000        4.   1645

    + 1730                                                                                               +2316

   -----------                                                                                             ----------

       7930                                                                                                 3961

    +   800                                                                                               +1355

   -----------                                                                                            ------------

       8730                                                                                                  5316

     +  170                                                                                               +   684

   ----------                                                                                             --------------

       8900                                                                                                  6000