Question

Doar cele incercuite, va rog repede! Dau coroana!!

Answer 1

2d  3x/5+1/2=7/8
2d  3x/2+1/2=7/8

2



2d 3x/5+1/2=7/8
3x/5=7/8-1/2
3x/5=3/2
x=5/2


2e.  4x/5+x/2=7/10
       (8x+5x)/10=7/10
       13x=7, x=7/10

2f, x:7/5=6/7
x*5/7=6/7
5x=6, x=6/5

2j  2x/9-4/3=5/2
     2x/9=5/2+4/3
     2x/9=23/6
       x=69/4

2k  8x/3-32/15=5     ( 2,1(3)=(213-21)/90=192/90=32/15)

     (40x-32)/15=5
   8x/15=5
   x=75/8