Question

a ) 2 supra 3 ( 1 + 3-7x supra 2 ) = x 
b ) [1,(3)x supra 2 - 9 supra 4 ] : o,6 = x supra 9 

Answer 1

a)  2/3 (1 +3- 7x/2)=x   aducem la acelasi numitor in paranteza

2/3 * (2+6-7x)/2=x

(8-7x)/3=x

8-7x=3x

3x+7x=8

10x=8
x=8/10= 4/5

b)1,(3)=1 intreg  3/9= 1 intreg  1/3= 4/3
0,6=6/10=3/5

(4x/3/2- 9/4) :3/5=x/9

(4x/3*1/2 -9/4):3/5= x/9

(2x/3 -9/4) :3/5 =x/9   aducem la acelasi numitor in paranteza

(8x-27)/12*  5/3=x/9

(40x-135)/36=x/9

360x-1215=36x

360x-36x=1215

324x=1215

x=1215/324

x=3,75