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