Răspuns:
1.a) -x+7=-23 -x=-23-7 -x=-30 x=30
b)[tex]\sqrt{2}[/tex]x+[tex]\sqrt{18}[/tex]=0 x=-rad18/rad 2. x=-rad9 x=-3
c)2,5x+2=3(1,5x+2) 25/10x+2=3*(15/10x+2) 5/2x+2=3(3/2x+2)
5/2x+2=9/2x+6 4x/2=-4 2x=-4 x=-2
2. 15(x-1)+4(2-3x)=11-2(x+4) 15x-15+8-12x=11-2x-8 3x-7=3-2x 5x=10 x=2
3. x+2/3-2x+3/4+5/3=1*5/6+7x-11/12/*2 4x+8-6x-9+20=22+7x-11
-2x-1+20=22-11+7x
-2x+19=11+7x
8=9x
x=8/9
Explicație pas cu pas:
