Question

Calculati: 2(x+1,2)=x+8; 25(x-2,3)=2x+6; 2(6-x)=8x-3: 8(1,2-x)=5x+100
rapid imi trebuie miine adica vineri

Answer 1

2(x+1,2)=x+8 vine 2x+2,4=x+8 |-x si vine  x+2,4=8 adica x=8-2,4 => x=5,6
25(x-2,3)=2x+6 vine 25x-57,5=2x+6 |-2x adica 23x-57,5=6 rezulta 23x=63.5 adica x=63.5/23 
2(6-x)=8x-3 vine 12-2x=8x-3 |+2x rezulta 12=10x-3 iar 10x=15 x=10/15
8(1,2-x)=5x+100 vine 9,6-8x=5x+100 |+8x adica 9,6=13x+100 iar 13x=-90,4 iar x=-90,4/13