a) P(x) = 4xyz - 2x² + 5xy -1 + 2x²
P(x) = 4xyz - (-2x² + 2x² ) + 5xy -1
P(x) = 4xyz + 5xy - 1
A(x) = 5x² + xyz - 3y + 2xy + y
A(x) = 5x² + xyz -( 3y - y ) + 2xy
A(x) = xyz + 2xy + 5x² - 2y
=> P(x) = 4xyz + 5xy - 1
A(x) = xyz + 2xy + 5x² - 2y
P(x)+A(x) =5xyz+ 7xy + 5x² - 2y -1
=> P(x) = 4xyz + 5xy - 1
A(x) = xyz + 2xy + 5x² - 2y
P(x)-A(x) =3xyz+ 3xy - 5x² + 2y -1
=> A(x) = xyz + 2xy + 5x² - 2y
P(x) = 4xyz + 5xy - 1
A(x)-P(x) =-3xyz- 3xy + 5x² - 2y +1
b) 2A(x) = (xyz + 2xy + 5x² - 2y) . 2
2A(x) =2xyz + 4xy + 10x² - 4y
=> P(x) = 4xyz + 5xy - 1
+2A(x)= 2xyz + 4xy + 10x² - 4y
P(x)+2A(x)= 6xyz + 9xy + 10x² -4y - 1
3A(x) = (xyz + 2xy + 5x² - 2y) . 3
3A(x) = 3xyz + 6xy + 15x² - 6y
2P(x) = ( 4xyz + 5xy - 1 ) . 2
2P(x) = 8xyz + 10xy - 2
=> 3A(x) = 3xyz + 6xy + 15x² - 6y
-2P(x) = 8xyz + 10xy - 2
3A(x)-2P(x) = -5xyz - 4xy + 2 + 15x² -6y
Xin hay nhất !
≈AkiraThanh≈
