Question

G h si i va rog este urgent dau coroana dau de toate

Answer 1

5x / 3 + 4x / 9 ( amplificam prima fractie cu 3 )

( 15x + 4x ) / 9 = 19x / 9

( x + 1 ) / 4 + ( 2x - 5 ) / 8 ( aplificam prima fractie cu 2 )

[ 2 ( x + 1 ) + 2x - 5 ] / 8 = ( 2x + 2 + 2x - 5 ) / 8 = (  4x -3 ) / 8

Answer 2

Răspuns

19x/9 ; (4x-3)/8 ; 4/21 ;

Explicație pas cu pas:

g) 5x/3+4x/9 =(5x*3+4x)/9 = 19x/9 ;

h) (x+1)/4+(2x-5)/8 = [(2(x+1)+2x-5]/8 = (2x+2+2x-5)/8 = (4x-3)/8 ;

i) (x+1)/7x+(x-3)/21x = [3(x+1)+x-3]/21x = (3x+3+x-3 )/21x = 4x/21x = 4/21 ; x≠0 ;