Răspuns :
a . 13* ( 5+21+40)= 13 *66 = 858
b. 437* ( 109-54+203 ) =437*258 = 112746
a)
13*5+13*21+13*40 = 13(5 + 21 + 40) = 13 * 46 = 598
b)
437*109-437*54+437*203 = 437(109 - 54 + 203) = 437 * 258 = 112746
13*5+13*21+13*40 = 13(5 + 21 + 40) = 13 * 46 = 598
b)
437*109-437*54+437*203 = 437(109 - 54 + 203) = 437 * 258 = 112746