5χ+3χ=180
<span>8χ=180</span>
<span>χ=180:8</span>
<span>x=22.5</span>
<span>5·22.5=112.5</span>
<span>3·22.5=67.5</span>
<span>BOC=112.5° ABC=67.5° </span>
5χ+3χ=180 градусов,8χ=180 гр.,χ=180:8,x=22.5,5*22.5=112.5,3*22.5=67.5, угол BOC=112.5гр, а угол ABC=67.5гр все