Odpowiedzi

2013-07-23T20:00:13+02:00

a) (-5)x50+20x[20-(8-5)] =

-250+20·(20-3) =

-250+20·17 =

-250+340 =

90


b) [72:(-3)]:(14-6) =

-24÷8 =

-3


c) (17-2):3-4+(-2) =

15÷3-4-2 =

5-4-2 =

-1


d)(-5)[30-(7-3)] =

(-5)(30-4) =

-5·26 =

-130


e) 23(81-78)-7(33-26) =

23·3-7·7 =

69-49 =

20


f) 3(4-1)-4(3-4)+5(7-5) =

3·3-4·(-1)+5·2 =

9+4+10 =

23

1 5 1