Question

Porównaj liczby a i b, wiedząc, że:
a=5-(x-y)+(y+2x)
b=(x-2y+xy)-(x+y)

x=
y=-2

Answer 1

A = 5 - (1/2-(-2))+((-2)+2*1/2) = 5 - (2 i 1/2) + (-1) = 5 - (1 i 1/2) = 3 i 1/2

b = ( 1/2 - 2(-2) + 1/2 * (-2) ) - ( 1/2 + (-2) ) = (1/2+4-1) - ( -1 i 1/2 ) = 
 = 1/2 + 3 + 1 i 1/2 = 5

a < b