Question

Ajutatima este urgenta mare urmatoarele exerciti
(18×8+56):[50×40:(220-2×60)]
Alt exercitiu :Verifica relatiile si scrie a pentru cele adevarate si f pentru cele false
A)(580-40:2×4):25+550<600
B) 300-2×[70-78:3)] :8>250
C) [(3+47+50):4+91]:2 >59
D) [100×(25+50×4)+500)] :10<3000

Answer 1

(18 × 8 + 56 ) : [ 50 × 40 : ( 220 - 2 × 60 ) ] = 10 

= ( 144 + 56 ) : [ 2 000 : ( 220 - 120 ) ] =
 
= 200 : ( 2 000 : 100 ) = 

= 200 : 20 =

= 10 

2)
A)
( 580 - 40 : 2 × 4 ) : 25 + 550 < 600  (Adevarat)
( 580 - 20 x 4) : 25 + 550 =
= 500 : 25 + 550 =
= 20 + 550 = 
= 570  <  600

B)
300 - 2 × [70 - (78 : 3 ) ] : 8  > 250 (Adevarat)
300 - 2 × ( 70 - 26) : 8 =
= 300 - 2 × 44 : 8 =
= 300 - 88 : 8 =
= 300 - 11 =
= 289 > 250


C)
 [( 3 + 47 + 50 ) : 4 + 91 ] : 2  > 59 ( Fals)
= ( 100 : 4 + 91) : 2 =
= ( 25 + 91 ) : 2 =
= 116 : 2 =
= 58 < 59 


D)
[100 × ( 25 + 50 × 4 ) + 500 ) ] :10 < 3 000 (Adevarat)
= ( 100 × 225 + 500 ) : 10 =
= ( 22 500 + 500 ) : 10 =
= 23 000 : 10 =
= 2 300  < 3 000