Rozwiążecie mi to? ;-)
a) b2-4ac, dla a=1 b=1/4 c=1/2
b) x2-3y2+xy, dla x=2 y=5
c) x2-6x+8, dla x=(-1)
d) 4a-2b, dla a=3 b=4
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a)
b²-4ac=(0,25)²-4·1·0,5=0,0625-2=-1,9375
b)
x²-3y²+xy=2²-3·5²+2·5=4-75+10=-61
c)
x²-6x+8=(-1)²-6·(-1)+8=1+6+8=15
d)
4a-2b=4·3-2·4=12-8=4