Question

Cho 2 đa thức: P= 5xyz+2zy-3x²-11      Q= 15-5x²+xyz-xy. Tính P+Q; P-Q

Giúp mik vs

Answer 1

P+Q=(5xyz+2zy-3x²-11)+(15-5x²+xyz-xy)

P+Q=5xyz+2zy-3x²-11+15-5x²+xyz-xy

P+Q=(5xyz+xyz)+2zy+(-3x²-5x²)+(-11+15)-xy

P+Q=6xyz+2zy-8x²+4-xy

P-Q=(5xyz+2zy-3x²-11)-(15-5x²+xyz-xy)

P-Q=5xyz+2zy-3x²-11-15+5x²-xyz+xy

P-Q=(5xyz-xyz)+2zy+(-3x²+5x²)+(-11-15)+xy

P-Q=4xyz+2zy+2x²-26+xy

Answer 2

P + Q= 5xyz + 2zy - 3x² - 11 + 15 - 5x² + xyz - xy

P + Q=(5xyz + xyz) + (-3x² - 5x²) + 2zy + (-11 + 15) - xy

P+Q= 6xyz - 8x²+2zy+4-xy

P - Q=(5xyz + 2zy-3x² - 11) - (15 - 5x²+xyz-xy)

P-Q=5xyz+2zy - 3x² - 11 - 15 + 5x² - xyz+ xy

P-Q = (5xyz - xyz) + (-3x² + 5x²)+ 2zy + (-11 -15)+ xy

P-Q = 4xyz + 2x² + 2zy - 26 +xy