Question

Oblicz wartość liczbową wyrazenia :

a)2x^2 - 6y ; x=-2 , y = -1/2

b)a*b / c -a^2 ; a=-1/2 , b=2/3 , c= -3/4

c)x/z + y/3 - 2/6 ; x= -2 y=4,2 z=-3,6

Answer 1

a)2x^2 - 6y= 2(-2^2)-6*(-1/2)=(2*4)+3=8+3=11

b)a*b / c -a^2=(-1/2)*2/3 / (-3/4)-(-1/2^2)=-1/3 / (-3/4)-1/4=-1/3 / -1=1/3

c)x/z + y/3 - 2/6= -2/-3,6 + 4,2/3 - 2/6=-2/ -36/10 + 1,4- 1/3=5/9-3/9+1,4=2/9+1,4=2/9+14/10=20/90+126/90=146/90=1 56/90= 1 28/45

Answer 2

a) 2x² - 6y = 2* 4 + 3 = 11

b) a*b/c - a² = -1/2 * 2/3 / -3/4 - 1/4 = 4/9 - 1/4 =  7/36