Question

A) (-5)x50+20x[20-(8-5)]
b) [72:(-3)]:(14-6)
c) (17-2):3-4+(-2)
d)(-5)[30-(7-3)]
e) 23(81-78)-7(33-26)
f) 3(4-1)-4(3-4)+5(7-5)

Answer 1

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