Question

Aceste exercitii sunt dintr-o fisa de CLASA A - III -A :
(9x9-6x6-a)+(13+28:4)=5x10 + 3 ;
(99-b-3x8)+2x6:2=8x2 +5x10 ;
(6x4 :3+c):7=16:4 ;
(9x4:6xd)-5x5=45:9 ;

Va rog ajutati-ma URGENT !

Answer 1

( 9 x 9 - 6 x 6 - a ) + ( 13 + 28 : 4 ) = 5 x 10 + 3
( 81 - 36 - a ) + ( 13 + 7 ) = 53
( 45 - a ) + 20 = 53
45 - a = 53 - 20
45 - a = 33
a = 45 - 33
a = 12

( 99 - b - 3 x 8 ) + 2 x 6 : 2 = 8 x 2 + 5 x 10
( 99 - b - 24 ) + 6 = 16 + 50
( 75 - b ) + 6 = 66
75 - b = 60
b = 75 - 60
b = 15

( 6 x 4 : 3 + c ) : 7 = 16 : 4
( 8 + c ) : 7 = 4
8 + c = 4 x 7
8 + c = 28
c = 28 - 8
c = 20

( 9 x 4 : 6 x d ) - 5 x 5 = 45 : 9
( 36 : 6 x d ) - 25 = 5
6d - 25 = 5
6d = 5 + 25
6d = 30
d = 30 : 6
d = 5