решите уравнение -2/5x+6=1/2(x-1)
-2/5x+6=1/2(x-1)
-2/5x+6=1/2x-1/2
-2/5x-1/2x=-6-1/2
2/5x+1/2x=6+1/2
4/10x+5/10x=12/2+1/2
9/10x=13/2
x=13/2:9/10=13/2*10/9=130/18=7 4/18;
Ответ: 7 4/18.
-2/5x+6=1/2(x-1) -0.9x+6+0.5=0 -0.9x+6.5=0
x=-(-6.5)/0.9 x=6.5/0.9 x=65/9 x=7 2/9