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3x²-y
a.x=3,y=2
3*(3)²-2= 27-2=25
b.x=5,y=-3
3*25+3=75+3=78
c.x=0,5 , y=jedna trzecia
3*0,25-1/3=0,75-0,33=0,42
d.x= -jedna czwarta, y=jedna piata
3*1/16-1/5= 3/16-1/5= 15/90-16/90=-1/90
e.x=0,y= -12
0+12=12
f.x= -2,y=20
3*4-20=12-20=-8
dla x=2
a.1410x(x-2)
1410*2(2-2)=1410*2*0=0
b.2x(x-1)+2
2*2(2-1)+2=4+2=6
c. 5x do kwadratu-2x
5*4-2*2=20-4=16
d.18x+20(1-x)
e.3x-x do kwadratu -(2-3x)
3*2-4-(2-3*2)=6-4-(-4)=6-4+4=6
f.12(x+0,4)-04x
12(2+0,4)-0,4*2=12(2,4)-0,8=28,8-0,8=28