Х+3х²=4х²+х
х+3х²-4х²-х=0
-х²=0
х²=0
х=0
= 19,2 + 8,224 - 28,004 =
= 27,424 - 28,004 =
= - 0,58
3(-2)^2-(-2)/4=3*4+2/4=12+1/2=12,5
3(1/3)^2-(1/3)/4=3*1/9-1/12=1/3-1/12=3/12=1/4
1/2*1/3-1/(1/2*1/3)+1=1/6-1/(1/6)+1=1/6-6+1=1/6-5=-29/6=-4*5/6
-5*0,4-1/(-5*0,4)+1=-2-1/(-2)+1=-2+1/2+1=-1+0,5=-0,5