Câu hỏi:

Cho $P=-2x{y}^3+10xy-3x^{2}y; Q=xy-7x^{2}y+5x{y}^3+10xy$ Tìm M = P-Q

A. $7x{y}^3-xy+4x^{2}y$

B. $-7x{y}^3-xy+4x^{2}y$

C. $-7x{y}^3-xy-4x^{2}y$

D. $7x{y}^3-xy-4x^{2}y$

Câu 1:

Cho $P=-2x{y}^3+10xy-3x^{2}y; Q=xy-7x^{2}y+5x{y}^3+10xy$ Tìm C biết C -2P = Q

A. $C=31xy-13x^{2}y+x{y}^3$

B. $C=-31xy-13x^{2}y+x{y}^3$

C. $C=-31xy-13x^{2}y-x{y}^3$

D. $C=31xy-13x^{2}y-x{y}^3$

Câu 2:

Cho $A=3x^3{y}^2+2x^{2}y-xy$ và $B=4xy-3x^{2}y+2x^3{y}^2+y^2$ Tính A - B

A. $x^3{y}^2+5x^{2}y-3xy-y^2$

B. $5x^3{y}^2+5x^{2}y-5xy+y^2$

C. $x^3{y}^2+5x^{2}y-5xy-y^2$

D. $x^3{y}^2+5x^{2}y-5xy+y^2$

Câu 3:

Cho $M=5x^{2}y-x{y}^2-xy; N=7x^3+y-2x{y}^2-3xy+1$ Tìm C biết M - C = N

A. $C=-7x^3+5x^{2}y+x{y}^2+2xy-y-1$

B. $C=-7x^3-5x^{2}y+x{y}^2+2xy-y-1$

C. $C=-7x^3-5x^{2}y-x{y}^2+2xy-y-1$

D. $C=7x^3-5x^{2}y-x{y}^2+2xy-y-1$

Câu 4:

Tìm đa thức A sao cho $A-\left(5x^4-2y^3+3x^2-5y+12\right)=6x^3+2y^3-y-1$

A. $6x^3+4y+5x^4+3x^2$

B. $6x^3+4y+5x^4-3x^2$

C. $6x^3-6y+5x^4+3x^2$

D. $6x^3+4y-5x^4-3x^2$

Câu 5:

Cho $A=3x^3{y}^2+2x^{2}y-xy$ và $B=4xy-3x^{2}y+2x^3{y}^2+y^2$

Tính A+B

A. $5x^3{y}^2-x^{2}y-3xy+y^2$

B. $5x^3{y}^2+5x^{2}y+3xy+y^2$

C. $5x^3{y}^2+5x^{2}y-3xy+y^2$

D. $5x^3{y}^2-x^{2}y+3xy+y^2$

Câu 6:

Cho $M=5x^{2}y-x{y}^2-xy$; $N=7x^3+y-2x{y}^2-3xy+1$

Tính P = M +N

A. $P=7x^3+5x^{2}y+3x{y}^2+4xy-y+1$

B. $P=7x^3+5x^{2}y-3x{y}^2-4xy+y+1$

C. $P=7x^3+5x^{2}y-3x{y}^2-4xy+y-1$

D. $P=7x^3-5x^{2}y-3x{y}^2-4xy+y+1$